Puzzzle to determine height of pyramid?

--------- #1434 - Thales measured the height of the pyramid.
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- In 600 B.C. Thales impressed the Pharaohs by measuring the height of the pyramid with 2 simple steps. He waited until the Sun was setting and he watched his shadow until it was as long as he was tall. He then walked to the center of one side of the pyramid and walked out to the peak of the shadow. He measured 50 feet. Then he went back to the pyramid and stepped off the length of one side, getting 180 feet. He then walked up to the Pharaoh and told him the height of the pyramid. Thales got the answer without using trigonometry. Can you?
- Please e-mail the answer. Only the right answer are accepted. :>)
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707-536-3272, Thursday, March 22, 2012