The surface area of cylinder =2πrh The surface area of cone =πrl l2=h2+r2 Where, 1= slant height of the cone h= height r= radius Calculation:
l2=h2+r2 ⇒l2=122+52 ⇒l2=144+25 ⇒l=13cm The surface area of the remaining figure = surface area of cylinder +2× Curved surface area of the cone ⇒2πrh+2πrl ⇒2πr(h+1) ⇒2π×5(30+13) ⇒430π