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Pi is the ratio of the circumference ( the perimeter) of a circle to its diameter.

You might have learned in school that if C is the circumference of the circle., then C=2Pir or C=pixd

from which we say pi = C/d or the ratio of the circumference of the circle to its diameter.

This has been known since ancient times! William Jones gave us the symbol we currently use for it. This comes from the 16th letter in the Greek alphabet.

So we use it to measure circles because of what it is.

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โˆ™ 2010-07-11 20:06:24
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Q: Why is pi used to measure circles?
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