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You mean circumference. It is pi multiplied by radius squared. So whatever the radius is times itself (or "squared") times 3.14 (pi). If the diameter is given, divide by 2 to get the radius and times the radius by itself. For example: diameter=10 radius=5 5x5=25
25x3.14=78.5... The circumference of the circle is 78.5 and then the units of measurement
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∙ 12y ago
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