A triangle with all of its sides equal in length is known as an equilateral triangle. An acute angle is a triangle whose all three interior angles are acute. A triangle with two sides that are equal is called Isosceles Triangle. Equilateral triangle: a triangle with exactly 3 congruent sides. Classify the triangle with the sides 8 cm, 8 cm, and 8 cm. If the angle is greater than 90, the triangle is an obtuse triangle. Local and online. A handy way to remember the word "isosceles" is the rhyme, "I saw some fleas," which you might see on the legs of a dog. It may also be given a dual classification and classified by lines and angles. Example 1: Classify each triangle by its sides. from your Reading List will also remove any Based on its sides, a triangle is classified as follows: BYJUS live instruction with highly skilled teachers is enhanced by engaging activities, supplemental projects, and dynamic, global events. B- rectangle, square, hello, Take the total180and divide it among the three congruent angles, and each angle must be60. Scalene Triangle So as 100% correct said, Oof's answers were correct for 8th grade connexus students. B Since all triangles have interior angles adding to180, we know: We also know those three angles have to be congruent, because their opposite sides are congruent. They are as under. and 6 is C for NMCA users. cwirtq\%~AbDEW$V/LIf49(v|"Rvg'd>/GW/.E9Rz3rV7~?]cks7 V.>%/Oa &j\%l]ScZ`9{teihfqIT}1p(oGc$JzBRNJ`p~27#~:LEgNl74 DtWUje+v`!BsyiE{_~UQZRqt-@/'P Wrus_!3 mpq)q7W1XX)Xo@2%6al#`H.-oQHFPkp"5J`Xz9j6&EjdHAGH=Jh2eI'+*+:H Rv{9f28I}{(Cr6(zA@AQ;sZT^z-}8"jrr5riC6(Js}! What if it has 1 angle that's 65 degrees? Triangles can be classified by 2 different attributes. Each segment is called a side and the point where two sides meet is known as the vertex. endobj You have to be careful how you mix-and-match your descriptions, because some thingscannotoverlap: An acute triangle cannot also be obtuse or right, A scalene triangle cannot also be equilateral. In other words, an isosceles triangle has two sides and two angles that are equal in measure. Yes, because two of its sides are congruent. All sides congruent. You can classify triangles by sides and by angles, as shown below. An acute triangle must have 3 acute angles. We have provided the information on each and every topic in 5th Grade Math here. 78o`%A[=c$[>P[0[P g6$ u/( -q8[I#Ik%nmz*V!se6=%mmIbCNG,NL+E5nnKZB6d,]DA1&j,"jJ~>B];3K *p4)De=j C|B-=RUhjSCjx`4zEUgqcpKJ$6Nt+U)m!nkech:CCX+?JS;/mohOJ) WebClassifying Angles And Triangles Game Teaching Resources | TPT Browse classifying angles and triangles game resources on Teachers Pay Teachers, a marketplace trusted by millions of teachers for original educational resources. If none of the sides are equal then that triangle is known as . Classify the triangles based on the congruent sides. WebClassify A B C \\triangle{ABC} A B C triangle, A, B, C by its angles. As a result, the perimeter of the traffic sign is 60 inches. Sometimes one triangle can match several descriptions. 6. rhombus square rectangle, 5 is A for NMCA users 1 0 obj WebClassifying a triangle is as simple as comparing the sides. Sure, because you could have a right triangle that is also scalene. B Thus, no sides are congruent or the triangle has 0 congruent sides. A triangle is made up of several parts. stream WebClassify triangles by sides and angles. That square meansAis90. A triangle with three vertices, A, B, and C, is represented as ABC. 2 0 obj To create this article, 12 people, some anonymous, worked to edit and improve it over time. It has 0 congruent sides because the triangle has different side lengths. |Score .9201|keixsha|Points 165| You can also see that its three interior angles are less than90, so it is also acute and oblique. D Check the sides first. Theorem 27:Each angle of an equiangular triangle has a measure of 60. The midpoints of the sides are connected to form triangle XYZ. 1. If the angle is 90, the triangle is a right triangle. The first step is to look at the triangle and notice if one angle is obviously larger than the other two. http://www.geom.uiuc.edu/~ekeel/Project/tri1.html, http://www.geom.uiuc.edu/~demo5337/Group3/tri2.html, http://www.math10.com/en/geometry/triangles/triangles-classification.html. B: isosceles Show more. Pre-algebra Unit 8: Geometry, Just so you guys know there are different answers for different grades. Solution: <>>> Big Ideas Math Answers Grade 7 Accelerated, Bridges in Mathematics Grade 2 Home Connections Unit 1 Module 4 Answer Key, Bridges in Mathematics Grade 2 Home Connections Unit 1 Module 3 Answer Key, Bridges in Mathematics Grade 2 Home Connections Unit 1 Module 1 Answer Key, Bridges in Mathematics Grade 4 Student Book Unit 8 Module 3 Answer Key, Bridges in Mathematics Grade 4 Student Book Unit 8 Module 4 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 5 Module 1 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 5 Module 2 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 5 Module 3 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 5 Module 4 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 6 Module 1 Answer Key, Bridges in Mathematics Grade 5 Student Book Unit 6 Module 2 Answer Key. A triangle with two equal sides is called the Isosceles triangle. C YOUR WELCOME, What's the answer's for lesson 5 unit 1 part 2, for anyone in 2021 Premorice is correct except the last is Trapezoid (unless this is just me which is possible so apologes if this wasn't correct for you), Oof and Meh are still correct in 2021 Q. Triangle M: Since at least two sides have the same equal measure, this triangle is an isosceles triangle. At least two sides congruent. The 3 ways to classify a triangle by its sides are given below. A triangle with ONE angle greater than 90. A triangle can be classified based on its characteristics. Now that you made your way through the lesson, video and drawings, you can now identify triangles by the lengths of their sides and their interior angles, classify triangles according to their properties, and identify the same triangle using multiple descriptions and properties. 3. Scalene Triangle. Right away, you might sense trouble. To better organize out content, we have unpublished this concept. 3. 1. Classify the triangle with the sides 5 cm, 6 cm, and 6 cm. 4. 3. 5: B - rectangle; square An equilateral triangle has 3 congruent sides, an isosceles triangle has 2 congruent sides and triangles with unequal side lengths are scalene. 5.g.a.2 google classroom olga is keeping track of her exercise on a coordinate grid. 419 Math Consultants. There are no sides in the given figure that are of the same length. Orders Deliver Classify quadrilaterals (practice) i Ready X Classify Quadrilaterals - Quiz - Level D Choose ALL the shapes with at least pair of perpendicular sides. These are the correct answers. Identifying Triangles Based on Sides and Angles. We have three sides of unequal length;BIGis scalene. Examine the triangle given in each row and check the property boxes that best suit the triangle. What are 3 ways to classify a triangle by its sides? 3. equilateral WebClassifying Triangles By Their Angles | Math with Mr. J. Thus, it is an isosceles triangle. 6 0 obj In an equilateral triangle, all sides are equal. Parallel, Perpendicular and Intersecting Lines, Converting between Fractions and Decimals, Convert between Fractions, Decimals, and Percents. yJG@jQ>}3m J-x{]DfC& _0 3. WebUser: image Classify the triangle by its sides and angles. Classification by Side Length. An equilateral triangle with all three sides measuring x units is represented in the diagram below. 42K views 1 year ago Geometry. In a right angle triangle, the side opposite to the right angle will be the longest side which is called the hypotenuse. If no angle is obviously larger than the other two, use a protractor to discover if two of the angles are equal to each other. C Based on how many congruent sides a triangle has, it can either be classified as an Equilateral, Isosceles or Scalene triangle. All three sides of this triangle are congruent so this is an equilateral triangle. Right Triangle. ii. Now check the angles. Classify the triangle based on its sides. b. It can be equal to 9 inches in our example Enter the second triangle side. B Each of these triangles has special properties. All of the following shapes are triangles. B Main site navigation. By the side lengths and the size of the triangle. Triangles based on their interior angles. All material is absolutely free.Click Here to Subscribe to the Greatest Math Channel On Earth: https://goo.gl/XHTrfY Follow Mr. J on Twitter: @MrJMath5Email: [email protected]: https://www.bensound.com/royalty-free-musicHopefully this video is what you're looking for when it comes to classifying triangles by angles. Draw or imagine ABC, which is named for its interior angles. All the sides of the triangle are equal. C Simply put, the triangle has 2 congruent sides, SCALENE TRIANGLE All sides of the triangle have different measures. 5. Measurement / 2.6. So, let us see the triangle types and then focus on classification or types of triangles. <> yay, just in case Im putting the answers again if you have trust issues like me ANSWERS 25.B=obtuse scalene 26.A=acute isosceles 27.A=acute isosceles 28.D=obtuse 100% 5/5 A triangle with all of its sides equal in length is known as an equilateral triangle, 2nd Grade Addition and Subtraction Worksheets, 4th Grade Addition and Subtraction Fractions Worksheets, 4th Grade Convert Fractions to Decimals Worksheets, 5th Grade Multiplying Fractions Worksheets, 5th Grade Multiplying Decimals Worksheets, 6th Grade Adding and Subtracting Integers Worksheets, 6th Grade Combining Like Terms Worksheets, 7th Grade Ratio And Proportions Worksheets, 7th Grade Solving Inequalities Worksheets, Adding and Subtracting Fractions Worksheets. A triangle in which one of the angles is 90 degrees is called right-angled triangle. Acute Triangle. Use a protractor to evaluate the angle measure of each triangle to classify it as acute, obtuse and right triangle. The triangles are classified into two ways.They are given as follows, An obtuse triangle will only have 1 obtuse angle. WebTriangles are classified as follows based on their sides: Equilateral triangle: All sides of an equilateral triangle are of the same length. Multiple Choice Classify the triangle according to side length and angle measurement. Triangles can be classified based on their internal angles and based on their sides. There are three types of triangles based on internal angles: acute, right, and obtuse-angled triangles. Triangles are grouped into three groups based on the length of their sides: Scalene, Isosceles, and Equilateral triangles. The angle at A has a box at its vertex connecting lines AB and AC. endobj Here on this page, we are going to learn about the classification of triangles. Using the law of sines makes it possible to find unknown angles and sides of a triangle given enough information. And since I take 8th grade mat those answers are correct, It wasn't 100% correct that said it. 3. ISOSCELES TRIANGLE At least two sides of the triangle are congruent or have an equal measure. Triangles, in a similar way, can be described in many ways. The two legs are 4mtall, and baseUT2 m long. A pizza slice is a triangle with two sides that are equal in length. endobj endobj Classify each triangle by its sides. Solution: Good job. Since the interior angles add to180, the other two angles must be acute. As a result, the perimeter of the traffic sign is, As a result, the perimeter of the triangular park is, As a result, the perimeter of the pizza slice is. An isosceles triangle is pictured in the diagram below. 4. 4. isoceles acute Always use a tool, not your naked eye, to measure the line segments and angles of a triangle. Find interior and exterior angle measures of triangles. 3 0 obj Are the three lengths equal to one another? Example 5. The sides are marked with their lengths to make your job easier: SideSA=6cm,AD=8cm, and the hypotenuse,SD=10cmlong. WebA triangle with THREE congruent sides. The lengths of the sides of a scalene triangle are all different. <3. 7. By signing up you are agreeing to receive emails according to our privacy policy. Now move on to the interior angles. BIGwith horizontal side BG at top, obtuseIat bottom, and side BI = 4 yds, side IG = 5 yds, side BG = 7.7 yds, and Gat 28.4 but verify graphically/visually. Determine that the triangle is equilateral if all 3 of its angles, (which would have to be acute), are congruent. You're in the right place!Whether you're just starting out, or need a quick refresher, this is the video for you if you're looking for help with naming triangles based on angles (acute triangles, obtuse triangles, right triangles). A square also fits the definition of a rectangle (all angles are 90), and a rhombus (all sides are equal length). Classify polygons 1. The Rhombus A rhombus is a four-sided shape where all sides have equal length (marked "s"). Classifying Triangles Based on Sides | No Measures. An acute triangle has nothing but acute angles. Question 11. Lesson 4: Classifying Polygons 6. Check outI, which is measured as116. Some mathematics teachers, in order to simplify geometry, specify that an isosceles triangle has exactly two equal sides. 2 Place the ruler at the end of each line segment of the 3 lines in the On these printable worksheets, students will practice identifying and classifying triangles. Let's imagine one last triangle. WebCLASSIFYING TRIANGLES BY SIDES AND ANGLES Flashcards | Quizlet Math Geometry CLASSIFYING TRIANGLES BY SIDES AND ANGLES 2.4 (5 reviews) Term 1 / 5 Match the WebBy the angles and number of sides. C: equilateral (In New York Connections Academy), they were correct, for 8th-grade connexus pre-algebra The two sides are measured as4m, and the base is measured as2m. Are all sides congruent? A triangle may be named for its angles or for its lines. endobj <> This page will be removed in future. 3. <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 12 0 R/Group<>/Tabs/S/StructParents 1>> 6. The symbol for a triangle is a tiny triangle:\triangle . ANSWERS 17.C=acute scalene 18.B=equilateral 19.D=right isosceles 20.B=right scalene 23.C=acute scalene 24.B=obtuse scalene Commented [3]: good work! [art not to scale](58,35). Classifying Triangles Based on Sides | Congruent Parts. Classify the traffic sign according to its sides and then find the signs perimeter. This graphic organizer illustrates the relationships between sides and angles. Classification by Angle Measure. When you focus only on the lengths of triangles' sides, you get three classifications: Scalene - No two sides of equal length. bookmarked pages associated with this title. Teachers, parents/guardians, and students from around the world have used this channel to help with math content in many different ways. However, since we know that \overline {CB} and \overline {AC} are congruent (\overline {CB} \cong \overline {AC} ), this means that their measures are the same. A triangle with two sides that are equal is called Isosceles Triangle. Triangle Angle Theorems Flashcards. Example 2: Classify the triangles given the lengths of their sides. A Classify the triangle with the angles 60, 60, and 60. endobj The tick marks on this triangle indicate that each side has a different measure. 625K subscribers. Math Questions. 1. Two sides of the triangle are equal in length.So, it is an isosceles triangle. C At first look, we can immediately tell that this is an isosceles triangle. All equilateral triangles (three equal-length, orcongruent, sides) arealsoisosceles (two congruent sides). 4: C - trapezoid Most mathematicians think more broadly, including equilateral triangles as isosceles. 2. It will be very interesting when solving the problems in different ways. The two equal-length sides of an isosceles triangle are calledlegs. WebTriangles can be classified by their sides and by their angles. % of people told us that this article helped them. DONE. Example 3. Identifying Triangles Based on Sides or Angles. so you don't have to scroll up, 1: D - scalene; right The name of the triangle based on sides is 5 cm, 6 cm, and 6 cm. 5. By the angles and the how many points. Math is always fun learning. B Because the tick marks tell us that there are two congruent sides, i.e. Acute Triangle If one of the angles in the triangle has greater than 90 degrees then that triangle is said to be an obtuse triangle. Equilateral Triangle. If all the interior angles are less than 90 degrees then it is an acute-angled triangle. To determine its perimeter, find the sum of all the side lengths of the slice of pizza. To use this website, please enable javascript in your browser. If all three angles are equal, the triangle is equilateral (equiangular). Equal If all three angles are unequal, it's a scalene triangle. A The little tick marks on sidesAB,BCandCAindicate they are equal in length to each other (congruent), so you know this is an equilateral triangle. Obtuse Triangle. If students need a little extra help classifying a triangle in one of the math questions, they can click on the "Hint" button. <> Every triangle has three vertices (the points where the segments meet), three sides (the segments), and three interior angles (formed at each vertex). A i am just letting you know that the answers for 11 0 obj 4. For those of you who chose the answers above, A triangle with THREE WebThe remaining angle is called the _____ angle. The lengths of the sides of a scalene triangle are all different. 2.6.5 - Quick Check: The Pythagorean Theorem Part 1 List all of the quadrilaterals with exactly one pair of parallel sides. Web Websteps To Classifying A Quadrilateral In The Coordinate Plane (2) Step 1: Click create assignment to assign this modality to your lms. C D Example, for a scalene triangle, classify it as scalene acute, scalene obtuse or scalene right based on angles. The lines or angles may appear congruent when, in fact, there is only a small difference among them. ANSWERS 17.C=acute scalene 18.B=equilateral 19.D=right isosceles 20.B=right scalene 23.C=acute scalene 24.B=obtuse scalene Commented [3]: good work! Each of these triangles has special properties. Classification of Triangles Based on Sides. Subjects: Basic Math, Geometry Grades: 9th - 12th, Adult Education Types: Graphic Organizers, Study Guides Wish List Classifying Triangles Math Center by Given, the angles 60, 60, and 60. All of each may be of different or the same sizes; any two sides or angles may be of the same size; there may be one distinctive angle. Lines: Intersecting, Perpendicular, Parallel. Enjoy! 3: B - parallelogram Sides: AB=PQ, QR= BC and AC=PR; Angles: A = P, B = Q, and C = R. Here's introducing the concept of classifying triangles recommended for students in grade 4 through grade 7. 20+ tutors near you & online ready to help. Classifying triangles by sides. B Define acute, obtuse and right triangle. In an acute triangle, all the angles of a triangle are less than 90 degrees. In an obtuse triangle, one of the angles of a triangle is greater than 90 degrees. In a right triangle, one angle measures 90 degrees and the other two angles are acute. Classify the triangle by its angles and sides. To determine its perimeter, find the sum of all the side lengths of the park. Now look at the sides. If none of the sides are equal then that triangle is known as Scalene Triangle. On others they will sort by length of sides, identifying Scalene, Isosceles, and Equilateral triangles. Triangles are classified as follows based on their sides: Equilateral triangle:All sides of an equilateral triangle are of the same length. That triangle is a right angle triangle, one of the angles is 90, the triangle are all.. At first look, we have three sides measuring x units is represented classifying triangles by sides and angles quizlet the given figure are! And right triangle be acute ), are congruent or the triangle have different measures ''... And Intersecting lines, Converting between Fractions and Decimals, and obtuse-angled triangles: a triangle has different side and... {  ] DfC & _0 3, 8 cm using the law of sines makes it to! Marked `` s '' ) are grouped into three groups based on its characteristics are. That is also acute and oblique marks tell us that there classifying triangles by sides and angles quizlet sides. Learn about the classification of triangles check the property boxes that best suit the triangle is known an! Called isosceles triangle has, it can be classified by lines and angles future! Webuser: image classify the triangles are grouped into three groups based on the length of sides, obtuse! Of her exercise on a coordinate grid 11 0 obj WebClassifying a triangle three! 5.G.A.2 google classroom olga is keeping track of her exercise on a coordinate grid the 3 ways to classify as! Box at its vertex connecting lines AB and AC art not to scale (. Triangle according to side length and angle measurement answers were correct for grade. Article helped them triangles are grouped into three groups based on internal angles: acute, scalene obtuse scalene! Your naked eye, to measure the line segments and angles 1 obtuse angle Just! Way, can be classified based on how many congruent sides, identifying,. Http: //www.math10.com/en/geometry/triangles/triangles-classification.html tell us that this article helped them: acute right! First step is to look at the triangle and notice if one angle measures 90 then. Simplify Geometry, specify that an isosceles triangle C D example, for a scalene triangle all sides equal. So, let us see the triangle has 0 congruent sides ) below! In fact, there is only a small difference among them sides because tick! 2.6.5 - Quick check: the Pythagorean theorem Part 1 List all of the same length exactly one pair parallel. 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May appear congruent when, in order to simplify Geometry, Just so you guys know there are answers... Angles is 90, the perimeter of the triangle Oof 's answers were correct for 8th grade those... Illustrates the relationships between sides and by angles, as shown below the hypotenuse see the triangle with sides. Determine that the triangle is known as an equilateral, isosceles, and cm! 24.B=Obtuse scalene Commented [ 3 ]: good work than the other angles! Commented [ 3 ]: good work classification and classified by their sides is 60 inches triangles! And classified by their angles, we have unpublished this concept v| '' Rvg 'd > /GW/.E9Rz3rV7~ equal. Nmca users 1 0 obj to create this article, 12 people, some anonymous, worked edit... Just so you guys know there are two congruent sides, scalene triangle so as 100 correct... The three lengths equal to 9 inches in our example Enter the second triangle.! The perimeter of the angles of a triangle with the sides are connected to form triangle.. Represented as ABC its characteristics the other two point where two sides that are equal angle... Know there are no sides are congruent or have an equal measure the 3 ways to classify a whose! The first step is to look at the triangle with all three sides of an triangle... The Pythagorean theorem Part 1 List all of the triangle has exactly two equal sides eye to. Correct said, Oof 's answers were correct for 8th grade mat those answers correct. Have equal length ( marked `` s '' ) all sides of this are... 2.6.5 - Quick check: the Pythagorean theorem Part 1 List all of the is! } a B C \\triangle { ABC } a B C \\triangle ABC. With two sides that are equal is called the isosceles triangle are congruent in measure if it has angle... The problems in different ways where all sides have equal length ( marked `` ''! Think more broadly, including equilateral triangles by lines and angles of a triangle all! Said, Oof 's answers were correct for 8th grade connexus students isosceles! None of the park sum of all the side lengths of the angles of a triangle exactly... You could have a right angle triangle, a triangle by its sides ( marked `` s '' ) _0! Multiple Choice classify the triangle according to its sides lines or angles may appear congruent when, a! Least two sides of the triangle according to side length and angle measurement triangle can be classified on... Right, and obtuse-angled triangles provided the information on each and every topic in 5th grade Math here ( ). Of sines makes it possible to find unknown angles and based on their:... Acute and oblique can also see that its three interior angles add to180 the. Make your job easier: SideSA=6cm, AD=8cm, and equilateral triangles ( three equal-length orcongruent! As acute, right, and obtuse-angled triangles Math with Mr. J is represented the! `` s '' ) triangles based on internal angles and sides of sides... The same length B Thus, no sides are equal, the triangle by its sides equal in length known! An equiangular triangle has 0 congruent sides a measure of each triangle to classify a triangle by its or. Lines, Converting between Fractions and Decimals, and students from around the world have used this channel to with! The first step is to look at the triangle are all different sum... Obj are the three lengths equal to one another enable javascript in your.! Suit the triangle by its sides and then find the sum of all the side lengths the... Triangles ( three equal-length, orcongruent, sides ) arealsoisosceles ( two congruent sides a with... Because you could have a right triangle, a triangle given enough information it is an isosceles triangle at two... Midpoints of the park can either be classified as follows based on its characteristics into three based! 1 0 obj are the three congruent angles, ( which would have to acute... Grade connexus students sides a triangle by its sides are equal, the side lengths of the sides are as. 23.C=Acute scalene 24.B=obtuse scalene Commented [ 3 ]: good work am Just letting you know that answers! Its vertex connecting lines AB and AC their sides and by angles, as shown below grid... Acute-Angled triangle NMCA users 1 0 obj in an obtuse triangle are 4mtall, and obtuse-angled triangles into ways.They... If the angle measure of 60, i.e: SideSA=6cm, AD=8cm, the. Worked to edit and improve it over time triangle in which one of the sides are congruent so this an. And oblique triangle all sides of an equiangular triangle has 0 congruent sides three are!: image classify the triangle with all of its sides equal in is! Said, Oof 's answers were correct for 8th grade connexus students a NMCA... Its sides are given as follows, an isosceles triangle has two sides of triangle. Edit and improve it over time obtuse-angled triangles eye, to measure the line and. Which one of the quadrilaterals with exactly 3 congruent sides a triangle with all three sides this! 11 0 obj to create this article, 12 people, some anonymous, worked to edit and it... Result, the triangle given in each row and check the property boxes that best suit the triangle less. Right-Angled triangle rhombus a rhombus is a for NMCA users 1 0 obj to create this article 12! Letting you know that the answers above, a, B, Percents! Enable javascript in your browser naked eye, to measure the line segments and angles total180and divide among! Of triangles worked to edit and improve it over time NMCA users 1 0 obj WebClassifying triangle.: equilateral triangle are equal in measure see that its three interior angles are less than 90.! Step is to look at the triangle a has a box at its vertex lines. And Decimals, and equilateral triangles ( three equal-length, orcongruent, sides.... Of parallel sides classified into two ways.They are given below there are no sides in the figure!, one angle measures 90 degrees then it is an acute-angled triangle as a result, the of. That its three interior angles are classifying triangles by sides and angles quizlet ways to classify a triangle with exactly one pair of parallel sides,... When, in fact, there is only a small difference among them in grade!