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396 x 7/22 = r^
126 = r^
√126= r
melintsi jalur melingkr berarti K
K = 396 m
π = 22/7
jdi :
K = 2 x π x r
396 = 2 x 22/7 x r
396 = 44/7 x r
r = 396x7 /44
r = 63 m