Jawabanmu

2014-01-01T14:28:19+07:00
S.Tabung = 2 π r t
                 =2 .23.7
                 =2.22.23

                 =1012 cm²
5 4 5
2014-01-01T15:47:43+07:00
L = 2 x 22/7 x 7 x 23
L = 1012 cm^2
4 4 4