find a The Diameter b the radius of a circle given the circumference 61.6
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circumference=2πr
2×22/7×r=61.6
r=61.6×7/2×22
r=9.8
diameter =r×2=9.8×2
=19.6
2×22/7×r=61.6
r=61.6×7/2×22
r=9.8
diameter =r×2=9.8×2
=19.6
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