Find the surface area of the helicoid r(r, ) = (r cos )i + (r sin )j + k, 0 2, 0

Find the surface area of the helicoid r(r, θ) = (r cos θ)i + (r sin θ)j + θk, 0 ≤ θ ≤ 2π, 0 ≤ r ≤ 1, in the accompanying figure.

(1, 0, 2TT) (1, 0, 0) X N 2TT