pake caranya yah kak mohin dibantu 17 sampe 18

17.luas alas×tinggi
=128cm2×28cm
=3.584cm3 (a)

18.v=phi×r×r×t
r=d:2
=28:2=14m
v=22/7×14×14×30m
=44×14×30m
=616×30m
=14.480m3 (a)