URGENT! 11. (07.04 MC) 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. (10 points) A right triangle is shown with one leg measuring 900 and another leg measuring h with an angle across from it measuring 49 degrees.