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2014-01-20T19:42:19+07:00
5(pi /x d )=5(3.14 X 6)=5(18.84)=94.2
1 5 1
2014-01-20T19:44:45+07:00
Panjang tali = 5(2*phi*r*) = 5(2*3,14*3) = 94,2 cm