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396 = 22/7 x 2R
396x22/7 = 2R
2R = 126
R = 63
jadi jari2nya 63
= 2 x 22 x r
7
= 396 m
396m = 2 x 22 x r
7
= 44 x r
7
44 x r = 396m
7
r = 396 : 44
7
r = 396 x 7
44
r = 63 m