#### In the adjoining figure, the shadow of a vertical tower on the level ground increases by 10 m, when the altitude of the sun changes from 45° to 30°. Find the height of the tower and give your answer, correct to of a metre.

**[Remark. Altitude of the sun means angle of elevation of the sun.]**

**Solution:**

Let TR be the tower and TR = h ;

Let BR = x,

AB = 10 m

Angles of elevation from the top of the tower

at A and B are 30° and 45° respectively.

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