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Most pies are circular.

Okay, that was a cheap joke. The actual answer is that pi is the ratio of the diameter of a circle to its circumference. That means it shows up a lot in equations involving circles and circular things. It also shows up in a lot of places you might not initially expect. For example, the sum of the infinite series 4 - 4/3 + 4/5 - 4/7 +4/9 ... is Pi.

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14y ago

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it is the diameter of the radies and the circumference of the square which is 360 degrees which is the same degree of the circle

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13y ago
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Q: What does a circle have to do with a pi?
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