tolong ketjain no 9-15 pls.......

1. V=22/7×14×14×20
=12.320cm2
2 V=22/7×3,5×3,5×16
=616cm2
3 V=22/7×7×7×10
=1540dm2
4 V=3,14×5×5×50
=392,5
5 V1= 22/7×14×14×20=12.320
V2=28×28×20=15.680
12.320
15.680
-----------+
28000cm3