Jawabanmu

2014-02-23T20:40:02+07:00
Π.d x  banyak putaran = 22/7 x 28 x 200 =17600 cm = 17,6m
2014-02-23T21:26:57+07:00
2.(pi).r = 2. 22/7. 28 = 176 × 200 = 35200