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Mathematics
Mathematics
Problem
Lines
A
B
AB
A
B
and
C
D
CD
C
D
intersect at
O
O
O
. If
∠
A
O
C
=
(
4
y
−
20
)
∘
\angle AOC = (4y - 20)^{\circ}
∠
A
O
C
=
(
4
y
−
20
)
∘
and
∠
B
O
D
=
(
2
y
+
40
)
∘
\angle BOD = (2y + 40)^{\circ}
∠
B
O
D
=
(
2
y
+
40
)
∘
, find the measure of
∠
A
O
D
\angle AOD
∠
A
O
D
. a)
60
∘
60^{\circ}
6
0
∘
b)
100
∘
100^{\circ}
10
0
∘
c)
80
∘
80^{\circ}
8
0
∘
d)
90
∘
90^{\circ}
9
0
∘
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