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Thales and the Pyramid


Thales (pronounced THAY-lees) is regarded as the father of Greek philosophy and mathematics.
Sometime around the year 600 BC, he visited Egypt to study geometry. There is a legend which says
that Thales impressed the Egyptians by calculating the height of the pyramid at Giza.

A 30 inch stick held vertically from the ground at 3 PM cast a 36 inch shadow,
while at the same time the pyramid cast a shadow 100 feet beyond its base.
At 4 PM, the same stick had a 45 inch shadow, while the pyramid's shadow extended 210 feet beyond its base.

How high was the pyramid?

Answer

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This page revised   March 31, 2004
 
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