Question

Jill is standing at the base of her apartment building. She measures the angle of elevation to the top of a nearby tower to be 40º. Then Jill goes to the roof of her apartment building, directly above her previous position, and measures the angle of elevation to the top of the same tower to be 30°.
If the height of the tower is 100 meters, the height of Jill's apartment building is how many meters?

Answer 1

Great job creating a diagram of the situation @yggdrasil