AB is a vertical pole with base at B. A man finds the angle of elevation of the point A from a certain point C on the gr

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Q 3080812717.     AB is a vertical pole with base at B. A man finds the angle of elevation of the point A from a certain point C on the ground is 60^{0} . He move away from the pole along line BC to a point D such that CD= 7 m , from D the angle of elevation of point A is 45^{0} , then height of the pole is
A

\frac{7\sqrt{3}}{2} ( \sqrt{3}+1 )

B

\frac{7\sqrt{3}}{2} ( \sqrt{3}-1 )

C

\frac{7\sqrt{3}}{2 ( \sqrt{3}+1 )}

D

\frac{7\sqrt{3}}{2 ( \sqrt{3}-1 )}

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