Question

An observer (O) is located 900 feet from a building (B). The observer notices a helicopter (H) flying at a 49° angle of elevation from his line of sight. How high is the helicopter flying over the building? You must show all work and calculations to receive full credit.

Answer 1

First of all: Have you sketched this situation and labeled all your constants and variables?
The observer is located 900 feet, horizontally, from the base of the building. How tall is the building? How much higher is the helicopter?