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AreaMethod
Exeter
2015
Problem - 2023
Quadrilateral
A
B
C
D
satisfies
A
B
=
4
,
B
C
=
5
,
D
A
=
4
,
∠
D
A
B
=
60
∘
, and
∠
A
B
C
=
150
∘
. Find the area of
A
B
C
D
.
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