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132 cm = 22/7 d
42 = d
r = 21 cm
1,32km=132000 cm
132.000cm=1000 x k
k=132.000/1000
k=132 cm
k=2 πr
132= 2 x 22/7 x r
pindahkan angka dan ubah tanda
132 x 7 : 2 : 22=r
21=r
maka jari jari=21cm