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Mathematics
Mathematics
Problem
In a parallelogram
A
B
C
D
ABCD
A
B
C
D
, diagonal
B
D
BD
B
D
is drawn. If
∠
A
B
D
=
65
∘
\angle ABD = 65^{\circ}
∠
A
B
D
=
6
5
∘
, then
∠
C
D
B
\angle CDB
∠
C
D
B
equals a)
90
∘
90^{\circ}
9
0
∘
b)
115
∘
115^{\circ}
11
5
∘
c)
65
∘
65^{\circ}
6
5
∘
d)
130
∘
130^{\circ}
13
0
∘
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