Angles in a Triangle By Mr G. Definition  Polygon  Polygon – a closed many straight-sided figure.

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Presentation transcript:

Angles in a Triangle By Mr G

Definition  Polygon  Polygon – a closed many straight-sided figure.

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

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

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

Property of triangles  The  The sum of all the angles equals 180º degrees. 90º30º 60º

Property of triangles  The sum of all the angles equals 180º degrees. 90º30º 60º 90º 30º + 180º

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

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

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

What is the missing angle? 90º 30º ? + 180º 30º90º ?

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

What is the missing angle? 30º 78º ? + 180º 78º30º ?

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