The formula for circumference using radius is, C = 2πr, C = πd, Radius = 10 cm → C = ?, 0.628 cm, 62.8, 6.28, 628, If radius doubles, what happens?, Circumference halves, Circumference doubles, Find radius given C = 20 cm., r = 3.2, r = 10, r = 32, r = 0.32

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