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Triangles I by Monica Yuskaitis

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

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

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

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

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

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

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

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

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

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

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

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

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

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