Here's the question you clicked on:
msingh
I JUST NEED A DIAGRAM From the top of a tower the angle of depression of an object on the horizontal ground is found to be 60degree. On descending 20 m vertically downwards from the top of the tower, the angle of depression of the object is found to be 30degree Find the height of the tower.
|dw:1359816427851:dw| @phi
because the ground is parallel to the horizontal lines, we can say the angle of elevation = angle of depression |dw:1359818247074:dw|
now you have two equations and 2 unknowns tan 60 = x/y tan 30 = (x-20)/y