Jawabanmu

2014-03-01T15:58:07+07:00
D=48 cm k = phi xd k= 3.14 x 48 k = 150,72 150,72 x 400=60288
2014-03-01T16:06:20+07:00
R = 24
d = 48
k =   \pi  x d
   =  3,14 x 48
   =  150,72
150,72 x 400 = 60.288