Triangles I

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Triangles I by Mrs. Martin Definition • Polygon – a closed many straightsided figure. Copyright © 2000 by Monica Yuskaitis Definition • Angle – two rays that meet at a common end point. 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 Definition • Triangle – a polygon with 3 angles and 3 straight sides. Copyright © 2000 by Monica Yuskaitis • The sum of all the angles equals 180º degrees. 60º Property of triangles 90º 30º Copyright © 2000 by Monica Yuskaitis • The sum of all the angles equals 180º degrees. 60º 90º + 30º 60º 180º 90º 30º 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 Property of triangles • The sum of all the angles equals 180º degrees. 60º 60º + 60º 60º 180º 60º 60º Copyright © 2000 by Monica Yuskaitis Property of triangles What is the missing angle? 70º 70º + ? 180º ? 70º 70º Copyright © 2000 by Monica Yuskaitis What is the missing angle? 90º 30º + ? 180º ? 30º 90º Copyright © 2000 by Monica Yuskaitis What is the missing angle? 60º 60º + ? 180º ? 60º 60º Copyright © 2000 by Monica Yuskaitis What is the missing angle? ? 78º 30º 30º 78º + ? 180º Copyright © 2000 by Monica Yuskaitis What is the missing angle? ? 40º 40º 40º 40º + ? 180º Copyright © 2000 by Monica Yuskaitis

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