Jawabanmu

2014-05-04T18:13:16+07:00
Kel = phi.d jadi d= 12 dan jari - jari = 6 cm
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2014-05-04T18:14:16+07:00
K = 2 phi.r
12 phi = 2.phi . r
r=12/2
r=6 cm 
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