I am puzzled by this and I don't see where i am making a mistake. must be over looking something or looking at too much. nevertheless give it shot and see who can come up with the right answer.. A radar unit indicates that the distance between its antenna and a plane is 37,417 feet. It also indicates that the plane is 30,000 feet north and 10,000 feet east of the antenna. What is the altitude of the plane?