1 Bob wants to measure the building and decides to use a mirror to do so He stands away from the building and looks into the mirror on the ground moving away or closer to the mirror until he can see the top of the building in the mirror His friend measures the distance between the building and the mirror and the mirror and Bob They draw the following picture to demonstrate the distances Solve for the height of the building 5 ft Cong s by prop of reflections Line of sight 10ft Mirror 100ft h Building Right angle with the ground