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

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Presentation on theme: "Triangles I by Monica Yuskaitis. Copyright © 2000 by Monica Yuskaitis Definition Polygon – a closed many straight- sided figure."— Presentation transcript:

1 Triangles I by Monica Yuskaitis

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

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

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

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

6 Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees. 90º30º 60º

7 Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees. 90º30º 60º 90º 30º + 180º

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

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

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

11 Copyright © 2000 by Monica Yuskaitis What is the missing angle? 90º 30º ? + 180º 30º90º ?

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

13 Copyright © 2000 by Monica Yuskaitis What is the missing angle? 30º 78º ? + 180º 78º30º ?

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


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