Jawabanmu

2014-06-07T14:46:07+07:00
Keliling = 3,14 x d
31,4 =3,14 x d
d = 10 cm
r = 5cm 

L = 3,14 x 5 x 5 + 3,14 x 5 x 13
  = 78,5 cm + 204,1 cm
  = 282,6 cm2

maaf kl salah ...