2*π*r*h + 2*π*r^2=?

Answer 1

2*π*r*h + 2*π*r^2 = 2*π*r*(h + r^2)

Answer 2

The surface area of a can of radius r and height h

answered I think you mean 2*π*r*h + 2*π*r^2 = 2*π*r*(h + r)

You do not need an r^3