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3,14=3,14/4×d pangkat 2
3,14=0,785×d pangkat 2
d^2=3,14/0,785
d^2=4
d=2
3,14=3,14×r pangkaT 2
r pangkat 2=3,14/3,14
r pangkat 2=1
r=1
k=3,14×2
k=6,28m