Triangles I

# Triangles I - The sum of all the angles equals 180 degrees...

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Triangles I by Mrs. Martin

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Copyright © 2000 by Definition Polygon – a closed many straight- sided figure.
Copyright © 2000 by Definition Angle – two rays that meet at a common end point.

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Copyright © 2000 by Definition Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30º
Copyright © 2000 by Definition Triangle – a polygon with 3 angles and 3 straight sides.

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

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Unformatted text preview: The sum of all the angles equals 180 degrees . 90 50 40 40 90 50 + 180 Copyright 2000 by Property of triangles The sum of all the angles equals 180 degrees . 60 60 60 + 180 60 60 60 Copyright 2000 by What is the missing angle? 70 70 ? + 180 70 70 ? Copyright 2000 by What is the missing angle? 90 30 ? + 180 30 90 ? Copyright 2000 by What is the missing angle? 60 60 ? + 180 60 60 ? Copyright 2000 by What is the missing angle? 30 78 ? + 180 78 30 ? Copyright 2000 by What is the missing angle? 40 40 ? + 180 40 40 ?...
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## Triangles I - The sum of all the angles equals 180 degrees...

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