 Triangles TOPIC 9 LESSON 9-5.

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Triangles TOPIC LESSON 9-5

Triangles can be classified by their sides.
3 equal sides equilateral triangle

Triangles can be classified by their sides.
2 equal sides isosceles triangle

Triangles can be classified by their sides.
equal sides scalene triangle

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.

Triangles can also be classified by their angles.
3 acute angles acute triangle All angles measure less than 90 degrees.

Triangles can also be classified by their angles.
1 obtuse angle obtuse triangle One angle measures greater than 90 degrees.

Classify this triangle by its sides and angles.

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

Classify this triangle by its sides and angles.

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

Classify this triangle by its sides and angles.

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

Can you classify this triangle by its sides and angles?

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

Classify this triangle by its sides and angles.

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

Now you know how to identify triangles.

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