How Do You Evaluate a Double Integral Over a Helicoid Surface?

[weckod]

eval. double integal sprt(1+x^2+y^2)ds

S is helicoid and r(u,v) = ucos(v)i+usin(v)j+vk, with 0 <=u<=4 and 0<=v<=4pi

help please i don't know what a helicoid is!

 

[Galileo]

http://mathworld.wolfram.com/Helicoid.html
The shape can also be visualized from the given parametrization. Or you could attemt to draw a picture.