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2014-04-22T10:18:23+07:00
Pnj tali = 10r+2πr = 10*10+2*3,14*10......... 100+62,8=162,8cm
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2014-04-22T10:24:10+07:00
panjang tali= 10r+2πr = 10*10+2*3,14*10
                                =100+62,8=162,8cm