Jawabanmu

2014-05-14T09:41:29+07:00
R=20cm
t=45cm
v=phi×r^2×t = 3,14×20×20×45 =56.520
2014-05-14T12:50:55+07:00
V=phi x r² x t
= 3,14 x 20² x 45
= 3,14 x 400 x 45
= 56.520cm³