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keliling = 22/7 x diameter
88 = 22/7 x d
diameter = 28 m
jari2 = 1/2 d = 14 m
d = k : π = 88 : 22/7 = 88 x 7/22 = 28 m
r = d/2 = 28/2 = 14 m
atau
r = k : 2 : π = 88 : 2 : 22/7 = 44 x 7/22 = 14 m
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