A tower of height b subtends an angle at a point 0 on the ground level through the foot of the tower and at a distance a from the foot of the tower. A pole mounted on the top of the tower also subtends an equal angle at 0. The height of the pole is

Options

A. `b((a^2-b^2)/(a^2+b^2))`
B. `b((a^2+b^2)/(a^2-b^2))`
C. `a((a^2-b^2)/(a^2+b^2))`
D. `a((a^2+b^2)/(a^2-b^2))`

Answer

B