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440 = 2 * (22 / 7) r
440 =( 44 / 7 ) r
10 = r / 7
r = 70 cm
K = 440 cm
π = 22/7
maka :
K = 2 x π x r
440 = 2 x 22/7 x r
440 = 44/7 x r
r = 440x7 / 44
r = 70 cm