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66 = 22/7 × d
d = 66/22 × 7
d = 21
r = 10,5 cm
66 =2 · 22/7 ·r
66 =44/7 ·r
66×7 =44r
462 :44 =r
10,5 =r
jari-jari lingkaran
=10,5 cm