Classify Triangles. x a m p E 1 E 2 B C. page 294 Chapter 25 Lesson 3. Triangles can be classified according to the length of the sides.

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1 SS MG 7 GG.2Know the lassify definitions two-dimensional of different figures triangles based on (e.g., the presence, or absence of parallel, or perpendicular ) and lines, identify or the presence their attributes. or absence of angles of a specified size. Recognize triangles as a category, and identify triangles. UNDRLYNG SKLLS AND ONS: meaning of angle; estimate measures; vocabulary lassify riangles Key d e a riangles can be classified according to the length of the sides. triangle All sides are the triangle wo sides are the triangle No two sides are the riangles can also be classified by their largest angle. Remember: An angle has a measure that is less than 90. A angle has a measure that is exactly 90. An angle has a measure greater than 90 and less than 180. So, you can name triangles by their largest angle. < 1 turn 4 triangle All three angles are. x a m p l 1 Which of these triangles are? xplain how you know. A B D = turn 1 4 triangle ontains one angle. x a m p > 1 turn 4 triangle ontains an angle. l 2 Which of these triangles are triangles? A B D SL Associates, nc. All s reserved. riangles A and D are because they each have two sides that are the A angle forms a square corner. Use the corner of your paper to check. riangle A is a triangle because it has a angle. page 294 hapter 25 Lesson 3

2 R A lassify each triangle as,, or. lassify each triangle as,, or. D SL Associates, nc. All s reserved. 1 have an angle and two of my sides are the and omplete each sentence. Use,, or. 10. sosceles triangles have 2 equal sides and the third one different. 1 Scalene triangles have no 2 sides that are the 1 quilatera l triangles have 3 sides that are the 1 have all angles and all of my sides are the and hapter 25 Lesson 3 page 295

3 R A at home! lassify each triangle as,, or. lassify each triangle as,, or. 1 have a angle and two of my sides are the and omplete each sentence. Use,, or. 10. quilateral triangles have 3 sides that are the 1 Scalene triangles have no 2 sides that are the 1 sosceles triangles have 2 equal sides and the third one different. D SL Associates, nc. All s reserved. 1 have an angle and all of my sides are different lengths. and page 198 Home Resource and Homework hapter 25 Lesson 3

4 R A lassify each triangle as,, or. lassify each triangle as,, or. D SL Associates, nc. All s reserved. 1 have an angle and two of my sides are the and omplete each sentence. Use,, or. 10. sosceles triangles have 2 equal sides and the third one different. 1 Scalene triangles have no 2 sides that are the 1 quilateral triangles have 3 sides that are the 1 have all angles and all of my sides are the and hapter 25 Lesson 3 Student Book age page 295

5 R A at home! lassify each triangle as,, or. lassify each triangle as,, or. 1 have a angle and two of my sides are the and omplete each sentence. Use,, or. 10. quilateral triangles have 3 sides that are the 1 Scalene triangles have no 2 sides that are the 1 sosceles triangles have 2 equal sides and the third one different. D SL Associates, nc. All s reserved. 1 have an angle and all of my sides are different lengths. and page 198 Home Resource and Homework hapter 25 Lesson 3

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