9. Exterior Angle Theorem.notebook
November 21, 2016
Topic: Triangles
Aim: What is the relationship between the interior and exterior
angles of a triangle?
HW: p.115 #12-15; p.117 #5-8
Do Now: Find the value of x.
A
50o
70o
B
X
C
D
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with
extended through B to D.
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9. Exterior Angle Theorem.notebook
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Exterior Angle of Triangle Theorem:
The sum of the measures of the remote interior
angles of a triangle is equal to the measure of the
related exterior angle.
b
d
c
a
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5
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