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Can anyone walk me through these trigonometry questions?

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1) A surveyor measures the top of a building 50 ft away from him. His angle-measuring device is 4 ft above ground. The angle of elevation to the top of the building is 63 degrees. How tall is the building?

2) An airplane pilot can see the top of a traffic control tower at a 20 degree angle of depression. The airplane is 5,000 ft from the tower. What is the altitude of the plane?

3) A forest ranger looking out from a ranger's station can see a forest fire at a 35 degree angle of depression. The ranger's position is 100 ft above the ground. How far is it from the ranger's station to the fire?