The angle of elevation of the top of a tower standing on a horizontal plane from

Question

The angle of elevation of the top of a tower standing on a horizontal plane from a point A is α. After walking a distance 'd' towards the foot of the tower the angle of elevation is found to be β. The height of the tower is

Options:

A . $$\frac{d}{{\cot \alpha + \cot \beta }}$$

B . $$\frac{d}{{\cot \alpha - \cot \beta }}$$

C . $$\frac{d}{{\tan \beta - \operatorname{tant} \alpha }}$$

D . $$\frac{d}{{\tan \beta + \operatorname{tant} \alpha }}$$

Answer: Option B

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