Jawabanmu

2014-06-03T19:27:39+07:00
Panjang busur=30○/360*3,14*20=1/12*62,8=5,23cm
2014-06-03T19:44:45+07:00
Rumus : K(lingkaran) x sudut juring / 360
panjang busur=2 \pi r*30/360=2 . 3,14 .10. \frac{30}{360} = 5,23