lines

1
lines
and angles
2
Given ?ACB 20 ?DEF 130 Find ?CDE
__________
D
F
A
E
C
B
3
Given ?ACB 20 ?DEF 130 Find ?CDE
__________
D
F
A
20
E
C
20
B
vertical (opposite) angles have the same measure
4
Given ?ACB 20 ?DEF 130 Find ?CDE
__________
D
F
130
A
20
E
C
B
5
Given ?ACB 20 ?DEF 130 Find ?CDE
__________
D
F
130
50
A
20
E
C
B
supplementary angles have measures whose sum is
180
6
Given ?ACB 20 ?DEF 130 Find ?CDE
_110______
D
F
50
A
20
E
C
B
the sum of the measures of the angles of a
triangle is 180
7
(No Transcript)
8
A
C
B
D
F
E
G
I
H
9
?
A
C
B
D
F
E
G
I
H
10
?
A
C
B
150
D
F
150
E
G
150
I
H
11
A
C
140
?
B
150
D
F
150
E
G
150
I
H
12
A
C
140
110
40
B
110
30
150
D
F
E
G
I
H