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66 = 22/7 . d
66 . 7 /22 = d
3 . 7 . 22/22 = d
21 cm = d
66= 22/7 × d
d = 66 : 22/7
d = 66 × 7/22
d = 3 × 7
d = 21
Jadi, panjang diameter lingkaran adalah 21 cm.