A team of mathematicians were required to measure the height of a flag pole.

They only had a measuring tape, and were getting quite frustrated trying to keep the tape along the
pole. It kept falling down, etc.

An engineer comes along, finds out their problem, and proceeds to remove the pole from the ground and
measure it easily.

When he leaves, one mathematician says to the other: "Just like an engineer! We need to know the
height, and he gives us the length!