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(i) The angle of elevation of the top of a tower at a point in the horizontal line through the foot of the tower is 45o. After walking a distance is 80m towards the foot of the tower along the same horizontal line the angle of elevation of the top of the tower changes to 60o. Find the height of the tower.

(ii) The angle of elevation of the top of a tower standing on a horizontal plane from a point P is θ. After walking distance 'd' towards the foot of the tower the angle of elevation is found to be ϕ. Find the height of the tower.

Kindly refer the  similar link for your query.
 ii
https://www.meritnation.com/ask-answer/question/p-on-the-ground-is-a-after-walking-a-distance-d-toward/some-applications-of-trigonometry/3522337
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