Answer to Question #174227 in Physics for Evangeline

Question

From a window of a building, the angle of depression of a dog on the ground is 70 degrees. From the rooftop of the same building, the angle of depression of the same dog is 40 degrees. How tall is the building if the window is 15 feet high

Answer 1

$$\frac{h}{15}=\frac{\tan{70} }{\tan{40}}\\h=49\ m$$