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# 9 5 triangles

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This slide show was prepared to help my fourth grade students understand and identify the different types of triangles and to help them with their homework.

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### 9 5 triangles

1. 1. TOPIC 9 LESSON 9-5<br />Triangles<br />
2. 2. Triangles can be classified by their sides.<br /> 3<br />equal<br />sides<br />equilateral triangle<br />
3. 3. Triangles can be classified by their sides.<br /> 2<br />equal <br />sides<br /> isosceles triangle<br />
4. 4. Triangles can be classified by their sides.<br /> 0<br />equal<br />sides<br />scalene triangle<br />
5. 5. Triangles can also be classified by their angles.<br /> 1<br />right <br />angle<br />right triangle<br />One angle measures 90 degrees. The other 2 are acute or less than 90 degrees.<br />
6. 6. Triangles can also be classified by their angles.<br /> 3<br />acute <br />angles<br /> acute triangle<br />All angles measure less than 90 degrees.<br />
7. 7. Triangles can also be classified by their angles.<br /> 1<br />obtuse<br />angle<br />obtuse triangle<br />One angle measures greater than 90 degrees.<br />
8. 8. Classify this triangle by its sides and angles.<br />
9. 9. Did you say. . . <br />equilateral, acute?<br />3 equal sides, 3 acute angles<br />
10. 10. Classify this triangle by its sides and angles.<br />
11. 11. Did you say . . .<br /> isosceles, right?<br /> 2 equal sides, one right angle<br />
12. 12. Classify this triangle by its sides and angles.<br />
13. 13. Did you say . . . <br />scalene, obtuse?<br />0 equal sides, 1 obtuse <br /> angle<br />
14. 14. Can you classify this triangle by its sides and angles?<br />
15. 15. Did you say . . . <br />scalene, right?<br /> 0 equal sides,1 right angle<br />
16. 16. Classify this triangle by its sides and angles.<br />
17. 17. Did you say. . . <br /> isosceles, acute<br /> 2 equal sides, 3 acute angles<br />
18. 18. Now you know how to identify triangles.<br />