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24-11-2015
Mathematics

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Using the formula C = 2πr, find the circumference of a circle with diameter of 28 inches.

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24-11-2015

C=2πr
1) Since the diameter is twice the radius, you do this: C=2π(28/2)
2) You divide: C=2π14
3) Since you can still multiply 2 and 14, you multiply them: C=28π
Therefore, the answer is C=28π

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