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440 = 22/7 x d
22/7 x d = 440
d = 440 / 22/7
d = 440/1 x 7/22
d = 3080/22
d = 140
d = 2r
140 = 2r
2r = 140
r = 140/2
r = 70
Jadi, jari-jari nya adalah 70 cm
440=2.22/7.r
r=440.7/44
r=70