1 exterior angles of a triangle stage 5 - year 9 press ctrl-a ©2009 – not to be sold/free to use

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Page 1: 1 Exterior Angles of a Triangle Stage 5 - Year 9 Press Ctrl-A ©2009 – Not to be sold/Free to use

Exterior AnglesExterior Anglesof a Triangleof a Triangle

Stage 5 - Year 9Stage 5 - Year 9

Page 2: 1 Exterior Angles of a Triangle Stage 5 - Year 9 Press Ctrl-A ©2009 – Not to be sold/Free to use

Proof

The Exterior AngleExterior Angle is the Sum of the Interior OppositeInterior Opposite Angles

Inte

rior

Opp

osite

Inte

rior

Opp

osite

Exterior Exterior AngleAngle

Exterior Angle of a Triangle.

Page 3: 1 Exterior Angles of a Triangle Stage 5 - Year 9 Press Ctrl-A ©2009 – Not to be sold/Free to use

The Exterior AngleExterior Angle is the Sum of the Interior OppositeInterior Opposite Angles

Inte

rior

Opp

osite

Inte

rior

Opp

osite

AA ++ BB == CC

CCExterior Exterior AngleAngle

Exterior Angle of a Triangle.

Inte

rior

Opp

osite

Inte

rior

Opp

osite

Example 1Example 1

4545oo

7070oo

7070oo + 45 + 45oo = C = C115115oo = C = C

C = 115C = 115oo

Exterior Exterior AngleAngle

Exterior Angle of a Triangle.

Exterior Exterior AngleAngleIn

terior

Opp

osite

Inte

rior

Opp

osite

Example 2Example 2

AAoo

7070oo

120120oo

A + 70A + 70oo = 120 = 120oo-70 -70-70 -70

A = 50A = 50oo

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