Triangles I.

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Presentation transcript:

Triangles I

Copyright © 2000 by Monica Yuskaitis Definition Polygon – a closed plane shape with 3 or more straight sides. Copyright © 2000 by Monica Yuskaitis

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

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

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

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

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

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

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

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

What is the missing angle? 90º 30º ? ? + 30º 90º 180º 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? 30º ? 78º ? + 78º 30º 180º Copyright © 2000 by Monica Yuskaitis

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