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Triangles I by Monica Yuskaitis.

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Presentation on theme: "Triangles I by Monica Yuskaitis."— Presentation transcript:

1 Triangles I by Monica Yuskaitis

2 Copyright © 2000 by Monica Yuskaitis
Definition Polygon – a closed many straight-sided figure. Copyright © 2000 by Monica Yuskaitis

3 Copyright © 2000 by Monica Yuskaitis
Definition Angle – two rays that meet at a common end point. Copyright © 2000 by Monica Yuskaitis

4 Copyright © 2000 by Monica Yuskaitis
Definition Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30º Copyright © 2000 by Monica Yuskaitis

5 Copyright © 2000 by Monica Yuskaitis
Definition Triangle – a polygon with 3 angles and 3 straight sides. Copyright © 2000 by Monica Yuskaitis

6 Copyright © 2000 by Monica Yuskaitis
Property of triangles The sum of all the angles equals 180º degrees. 60º 90º 30º Copyright © 2000 by Monica Yuskaitis

7 Copyright © 2000 by Monica Yuskaitis
Property of triangles The sum of all the angles equals 180º degrees. 60º 90º 30º + 60º 180º 90º 30º Copyright © 2000 by Monica Yuskaitis

8 Copyright © 2000 by Monica Yuskaitis
Property of triangles The sum of all the angles equals 180º degrees. 40º 90º 40º 50º + 180º 90º 50º Copyright © 2000 by Monica Yuskaitis

9 Copyright © 2000 by Monica Yuskaitis
Property of triangles The sum of all the angles equals 180º degrees. 60º 60º 60º 60º + 180º 60º 60º Copyright © 2000 by Monica Yuskaitis

10 What is the missing angle?
70º 70º ? ? + 180º 70º 70º Copyright © 2000 by Monica Yuskaitis

11 What is the missing angle?
90º 30º ? ? + 30º 90º 180º Copyright © 2000 by Monica Yuskaitis

12 What is the missing angle?
60º 60º ? ? + 180º 60º 60º Copyright © 2000 by Monica Yuskaitis

13 What is the missing angle?
30º ? 78º ? + 78º 30º 180º Copyright © 2000 by Monica Yuskaitis

14 What is the missing angle?
40º ? 40º ? + 40º 40º 180º Copyright © 2000 by Monica Yuskaitis


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