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Penyelesaian
22/7 . d = 660
d = 660 . 7/22
d = 30.7
d = 210 cm
r = 105 cm
Maaf kalau salah
660cm = 2.22/7.r
660 = 44/7.r
660.7 = 44.r
4620 = 44.r
r = 4620/44 = 105 cm