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The perimeter of a circle is called the circle's "circumference". It's the distance an ant must walk

on the curved line in order to get back to where he started walking from.

The diameter of the circle is the distance across it through the center. It's the longest line

you can draw that stays completely inside the circle.

The radius of the circle is half of the diameter. It's the distance from the center to any point

on the circle.

The circumference if the circle is (pi) times (the diameter).

The circumference is also (2 pi) times (the radius).

(Pi) is approximately 3.14159 26535 89792 . The decimal never comes out even.

It's also OK to use ( 22/7 ) for pi. That puts you within 0.1% of the correct answer.

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โˆ™ 2010-02-03 03:59:50
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Q: What is the formula for the perimiter of a circle?
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