Hello, amberkraidich!

If you make a sketch, a trig relation should suggest itself.Suppose you live about 5.1 miles away from a tower.

From your home, you see a plane directly above the tower.

Your angle of elevation from the plane is 21º.

What is the plane's altitude?Code:P * | * | * a | * | * | 21° * T * - - - - - - - - - - - * H 5.1

Your house is at ; the tower is at

The plane is at

Relative to , we have: .

What trig function is suggested?