A camera crew on the ground is recording the act of a performer walking a tightrope stretched between two buildings. A member of
the camera crew who is 1.8 m tall is almost directly below one end of the tightrope. When the performer steps out onto the other end of the tightrope, the angle of elevation is 75 . If the buildings are 30 m apart, how many meters above the ground is the performer?
