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Square the radius and multiply the result by 3.14. You may want additional digits of pi for greater precision, but that's the basic idea.

The formula is πr² (that's "pi r squared," if the character doesn't show up properly).

ANSWER:The above answer is wrong! The above gives the area of a circle, not the circumference. Besides pie are round, cornbread are square.

Pi = 3.1416 as stated above.

The circumference of a circle is 2 times the radius times pi .

This is because pi for all circles is the circumference divided by the diameter. So, pi times the diameter equals the circumference. The diameter is twice the radius.

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Q: How do you find the circumference of a circle from the radius?
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