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Mathematics
Problem
Quadrilateral ABCD is inscribed in a circle. Given: AB = 5, AC =
3
5
3\sqrt{5}
3
5
, AD = 7, and
∠
B
A
C
=
∠
C
A
D
\angle BAC = \angle CAD
∠
B
A
C
=
∠
C
A
D
. Find the radius of the circumcircle.
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