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K = 396 cm
π = 22/7
maka :
K = 2 x π x r
396 = 2 x 22/7 x r
396 = 44/7 x r
r = 396x7 / 44
r = 63 cm
396 = 2 x 22/7 x r
396 = 44/7 x r
r = 396 x 7/44
r = 63