tolong ya bantuin no 8,9,sama no 10

Volume bola= 4/3×π× r × r × r
jadi...
no.8
=4/3×22/7×28cm×28cm×28cm
=91.989,33333cm³
no.9
=4/3×3,14×20cm×20cm×20cm
=33.493,33333cm³
no.10
=4/3×22/7×49cm×49cm×49cm
=493.005,33333cm³