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124_G6U25_WB_˙—» ¿º 2011.6.23 3:32 PM ˘ ` 15 124-P1-1
Triangles and Angles
AB CD, find the unknown angle.
A
Da
40 60 C
B E
Step 1. Find m ACB.
Step 2. What is the sum of the interior angles of a triangle?
Step 3. Find m a.
Triangles and Angles
AB CD, find the unknown angle.
A
Da
40 60 C
B E
Step 1. Find m ACB.
Step 2. What is the sum of the interior angles of a triangle?
Step 3. Find m a.
