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Circumference of a circle if diameter is 18
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Circumference of a circle if diameter is 18

User Woolyninja
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Pie r squared
R= half of diameter
User Cristiano Coelho
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The formula for circumference is 2piR, with R being the radius, which is half of the diameter. If the diameter is 18, the radius if 9 (half of 18).

Thus the formula is 2pi(9), which simplifies to 18pi.

User Skozin
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