Jawabanmu

2014-09-03T17:20:46+07:00
R =diameter :2 =28:2 = 14cm
la = 2phir (t+r) =2.22/7.14(10+14) =2112cm^
v =phir^t =22/7.14.14.10 = 6160cm3


2014-09-03T17:24:20+07:00
D = 28 cm
t = 10 cm

dit
jari-jari = diameter dibagi 2 = 28/2 = 14 cm

luas alas =  \pi r2 = 22/7 x 14 x 14 = 616 cm

v=  \pi r2.t = 22/7 x 14 x 14 x 10 = 6160 cm