What's the formula for circumference of a circle?

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What's the formula for circumference of a circle?

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Answer 1 · 2016-01-07T22:17:09

If a circle has radius #R#, its circumference equals to #2piR#, where #pi# is an irrational number that, approximately, equals to #3.1415926#

Explanation:

The most interesting part is, obviously, how this formula can be obtained.
I suggest you to watch a lecture on UNIZOR Geometry - Length and Area - Circumference of a Circle that explains in details how this formula can be derived.

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What's the formula for circumference of a circle?

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