Question

A cylinder of base radius r and height h is dipped vertically to half the height in a bucket full of purple paint . find the area of the surface which get painted ?

Answer 1

cylinder radius = r
height = h
is dipped half in paint bucket
then the area of half cylinder = c.s.a./2+area of circle
= (2*22/7*r*h/2)+(22/7*r^2)
=22/7*r(r+h)

Answer 2

1/2 csa +area of base
1/2*2πrh+πr*r
πr(r+h)=answer