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66 = 2 × 3,14 × r
66 = 6,28r
r = 10,5
d = r × 2
d = 10,5 × 2
d = 21
66 = 2 x 3,14 x r
66 = 6,28 x r
r = 66 : 6,28
r = 10,5
d = 10,5 x 2
d = 21 cm
Jadi, diameternya 21 cm