Angles in a Triangle By Shirley Sides 2006.

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Presentation transcript:

Angles in a Triangle By Shirley Sides 2006

Definition Polygon – a closed many straight-sided figure.

Definition Angle – two rays that meet at a common end point.

Definition Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30º

Definition Triangle – a polygon with 3 angles and 3 straight sides.

Property of triangles The sum of all the angles equals 180º degrees. 60º 90º 30º

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

The sum of all the angles equals 180º degrees. Property of triangles The sum of all the angles equals 180º degrees. 40º 90º 40º 50º + 180º 90º 50º

The sum of all the angles equals 180º degrees. Property of triangles The sum of all the angles equals 180º degrees. 60º 60º 60º 60º + 180º 60º 60º

What is the missing angle? 70º 70º ? ? + 180º 70º 70º

What is the missing angle? 90º 30º ? ? + 30º 90º 180º

What is the missing angle? 60º 60º ? ? + 180º 60º 60º

What is the missing angle? 30º ? 78º ? + 78º 30º 180º

What is the missing angle? 40º ? 40º ? + 40º 40º 180º

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