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Triangles TOPIC 9 LESSON 9-5.

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Presentation on theme: "Triangles TOPIC 9 LESSON 9-5."— Presentation transcript:

1 Triangles TOPIC LESSON 9-5

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

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

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

5 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.

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

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

8 Classify this triangle by its sides and angles.

9 3 equal sides, 3 acute angles
Did you say. . . equilateral, acute? 3 equal sides, 3 acute angles

10 Classify this triangle by its sides and angles.

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

12 Classify this triangle by its sides and angles.

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

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

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

16 Classify this triangle by its sides and angles.

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

18 Now you know how to identify triangles.


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