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Triangles TOPIC LESSON 9-5

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**Triangles can be classified by their sides.**

3 equal sides equilateral triangle

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**Triangles can be classified by their sides.**

2 equal sides isosceles triangle

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**Triangles can be classified by their sides.**

equal sides scalene triangle

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**Triangles can also be classified by their angles.**

1 right angle right triangle One angle measures 90 degrees. The other 2 are acute or less than 90 degrees.

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**Triangles can also be classified by their angles.**

3 acute angles acute triangle All angles measure less than 90 degrees.

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**Triangles can also be classified by their angles.**

1 obtuse angle obtuse triangle One angle measures greater than 90 degrees.

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**Classify this triangle by its sides and angles.**

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**3 equal sides, 3 acute angles**

Did you say. . . equilateral, acute? 3 equal sides, 3 acute angles

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**Classify this triangle by its sides and angles.**

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Did you say . . . isosceles, right? 2 equal sides, one right angle

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**Classify this triangle by its sides and angles.**

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Did you say . . . scalene, obtuse? 0 equal sides, 1 obtuse angle

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**Can you classify this triangle by its sides and angles?**

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Did you say . . . scalene, right? 0 equal sides,1 right angle

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**Classify this triangle by its sides and angles.**

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Did you say. . . isosceles, acute 2 equal sides, 3 acute angles

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**Now you know how to identify triangles.**

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Lesson 8.3 Concept: How to classify triangles by their sides and angles. An equilateral triangle has three sides of the same length. An isosceles triangle.

Lesson 8.3 Concept: How to classify triangles by their sides and angles. An equilateral triangle has three sides of the same length. An isosceles triangle.

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