the angle of elevation of the top of a towerfrom two points distant a and b from the base and in the same line with it are complementary prove that the height of the tower is root (ab)
Here is the link for the answer to your query:
https://www.meritnation.com/ask-answer/question/the-top-of-a-tower-from-2-points-p-q-at-distances-of/some-applications-of-trigonometry/1538499
https://www.meritnation.com/ask-answer/question/the-top-of-a-tower-from-2-points-p-q-at-distances-of/some-applications-of-trigonometry/1538499