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In a quadrilateral ABCD, AC is the bisec...

In a quadrilateral ABCD, AC is the bisector of the (AB, AD) which is `(2pi)/(3)`, `15|AC|=3|AB|=5|AD|`, then `cos(BA, CD)` is equal to

A

`(-sqrt(14))/(7sqrt(2))`

B

`-(sqrt(21))/(7sqrt(3))`

C

`(2)/(sqrt(7))`

D

`(2sqrt(7))/(14)`

Text Solution

Verified by Experts

The correct Answer is:
C
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