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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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Triangle Classification. Objectives Classify triangles by their angle and side measures Find the sum of the measure of the interior and exterior angles.

Triangle Classification. Objectives Classify triangles by their angle and side measures Find the sum of the measure of the interior and exterior angles.

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