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125_G6U27_WB˜ ˙—» ¿º 2011.6.23 3:44 PM ˘ ` 3
125-B2-1
The Interior and Exterior Angles of a Triangle
1. The exterior angle of a triangle is equal to the sum of the two angles that are not
adjacent to that angle. Find the measure of the unknown angle.
Example
30
a 70
a. a b.
60 80
50 a 45
c. d.
70
a 120 115
a
125-B2-1
The Interior and Exterior Angles of a Triangle
1. The exterior angle of a triangle is equal to the sum of the two angles that are not
adjacent to that angle. Find the measure of the unknown angle.
Example
30
a 70
a. a b.
60 80
50 a 45
c. d.
70
a 120 115
a
