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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Exterior AnglesExterior Anglesof a Triangleof a Triangle
Stage 5 - Year 9Stage 5 - Year 9
Press Ctrl-APress Ctrl-A©2009 – Not to be sold/Free to use
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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.
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The Exterior AngleExterior Angle is the Sum of the Interior OppositeInterior Opposite Angles
Inte
rior
Opp
osite
Inte
rior
Opp
osite
AA ++ BB == CC
AA
BB
CCExterior Exterior AngleAngle
Exterior Angle of a Triangle.
44
Inte
rior
Opp
osite
Inte
rior
Opp
osite
Example 1Example 1
4545oo
7070oo
CC
7070oo + 45 + 45oo = C = C115115oo = C = C
C = 115C = 115oo
Exterior Exterior AngleAngle
Exterior Angle of a Triangle.
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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
Exterior Angle of a Triangle.
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