My, That’s Tall!

I was on a road trip with a friend when we drove past a very tall radio tower. I told my friend “That thing has to be at least a thousand feet tall!” He looked out the window for a moment, and said “I’ll bet it’s closer to 1500 feet.” We stopped at a gas station and asked how tall the tower was, and it was exactly 1500 feet tall! Now that I owe my friend a steak dinner, how could he tell how tall the tower was?

Check Braingle.com for the answer.