$r=1, c=6.28$ $r=10, c=62.8$ $r=100, c=628$
Work Step by Step
When r=1: $C=2\times3.14\times1$ $C=6.28$ When r=10: $C=2\times3.14\times10$ $C=62.8$ When r=100: $C=2\times3.14\times100$ $C=628$
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