g
d e
f
b
a
c
42 ◦
A
C
B
D
2.Find all the unknown angles in the figure:
E
F
G
H
A
B
C
D
70 ◦
80 ◦
1
1
2
3
3
2
1
(^23)
1
1
3.Find the value ofxin the figure:
X
Z
Y
A D
B C
x 20 ◦
x
60 ◦
240 7.1. Introduction
g
d e
f
b
a
c
42 ◦
2.Find all the unknown angles in the figure:
E
F
G
H
A
B
C
D
70 ◦
80 ◦
1
1
2
3
3
2
1
(^23)
1
1
3.Find the value ofxin the figure:
x 20 ◦
x
60 ◦
240 7.1. Introduction