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Mathematics
Mathematics
Problem
Lines
A
B
AB
A
B
and
C
D
CD
C
D
intersect at point
O
O
O
. If
∠
A
O
C
=
72
∘
\angle AOC = 72^{\circ}
∠
A
O
C
=
7
2
∘
, find the measure of
∠
B
O
D
\angle BOD
∠
B
O
D
and state the relationship used.
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