An important question from RS Aggarwal of Height and distance in which we to prove that the height of the tower is 129.9 m when the angle of elevation of the top of a tower from ta point on the same level as the foot of the tower is 30° . On advancing 150 m towards foot of the tower, the angle of elevation becomes 60°.

Class 10, Chapter 14, question no 26.

Hope it helps you