Page 247 - NUMINO_WB_6B
P. 247
125_G6U27_WB˜ ˙—» ¿º 2011.6.23 3:44 PM ˘ ` 1
125-B1-1
The Sum of Interior Angles of a Triangle
1. The sum of interior angles of a triangle is 180 . Find the measure of the unknown
angle.
Example
a
70 60 80
40
a. b.
a
a
50 50
c. d.
30
120
25
a
35 a
125-B1-1
The Sum of Interior Angles of a Triangle
1. The sum of interior angles of a triangle is 180 . Find the measure of the unknown
angle.
Example
a
70 60 80
40
a. b.
a
a
50 50
c. d.
30
120
25
a
35 a
