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The perimeter of a circle is called it circumference, "C". To calculate it, multiply its diameter by the constant, pi. Pi is roughly equal to 3.14159265.

So, let's say you have a circle with a 10-foot diameter.

Then C=10 x 3.14159265 = 31.42 (rounded off).

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Q: How do you work out the perimiter of a circle?
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