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<=> 660 cm
K= . d
660 = 22/7 . d
660 . 7 / 20 = d
210 = d
jadi diameter adalah 210 cm atau 2,1 m
= 6.6 m
keliling =
6.6 = 22/7 . d
d = 6.6 x 7/22
d = 2.1 m