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K = 62,8
maka :
K = 2 x 3,14 x r
62,8 = 6,28 x r
r = 62,8 / 6,28
r = 10
jadi jari2 = 10 cm
dan diameter = 2 x 10 = 20 cm
d = k : π
d = 62,8 cm : 3,14
= 20 cm
r = d : 2
= 20 : 2
= 10 cm