Please answer 8 Share with your friends Share 1 Neha Sethi answered this Initial diameter of base=100mm=10 cmFinal diameter of base 10+21100×10=12.1 cmLet the radius of top be r and height be hInitial volume=V1=13π52h+πr2hFinal volume =V2=13π12.122h+πr2h=13π6.052h+πr2hGiven: V2V1=1.21⇒13π6.052h+πr2h13π52h+πr2h=1.21⇒6.052+r252+r2=1.21⇒6.052+r2=30.25+1.21r2⇒6.3525=0.21r2⇒r2=6.35250.21⇒r2=1214⇒r=112=5.5 cmSo, r=5.5 cm=55mm 1 View Full Answer