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124_G6U25_WB_˙—» ¿º 2011.6.23 3:32 PM ˘ ` 8
124-B4-2
2. Find the measure of the unknown angle. AB CD
Example
AB
45
C aD
a. b.
A A
C 130
B C 60 B
a a
D
D
d.
c.
A C
A 30 B
a Ca D
120
BD
124-B4-2
2. Find the measure of the unknown angle. AB CD
Example
AB
45
C aD
a. b.
A A
C 130
B C 60 B
a a
D
D
d.
c.
A C
A 30 B
a Ca D
120
BD
