A pilot flying an aeroplane at a certain constant height reported that the angle of depression of a lake was 28°.After flying 30km in the direction of the lake, the angle of depression became 42°.Find the height of the aeroplane.

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.