Jawabanmu

Jawaban paling cerdas!
2014-07-06T19:44:06+07:00
1 putaran = 360 derajat
berarti 72 derajat =  \frac{1}{5} putaran
1 putaran = 2 pi radian
maka  \frac{1}{5} putaran =  \frac{1}{5} *2 pi radian
 \frac{2*3,14}{5} = 1,256 radian
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