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 surface which gets painted

Answer 1

Radius = r

Height = h

It is given that the cylinder is dipped vertically half to the height in bucket

so the height is = h/2

so area of the painted cylinder 

= 2πrh + πr²
=2×π×r×h/2 +πr²
= πrh + πr²

Answer 2

Radius = r

Height = h

It is given that the cylinder is dipped vertically half to the height in bucket

so the height is = h/2

so area of the painted cylinder 

= 2πrh + πr²
=2×π×r×h/2 +πr²
= πrh + πr²