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A. k = phi * d = 22/7 * 14 = 44 cm
B. k = phi * 2 * r = 22/7 * 2 * 21 = 132 cm
Dengan phi = 3,14
A. k = phi * d = 3,14 * 20 = 62,8 cm
B. k = phi * 2 * r = 3,14 * 2 * 20 = 125,6 cm