- #1

electroguy02

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For the surface with parametric equations r(s,t) = <st, s+t, s-t>, find the equation of the tangent plane at (2,3,1).

Find the surface area under the restriction s^2 + t^2 <= 1.

2. Homework Equations [/b]

3. The Attempt at a Solution [/b]

I already found that the equation of the plane is -2x+3y-z=4. I just don't know what to do with that parametrization to find the surface area. I tried plugging in the values of r(s,t) into x, y, and z, then integrating after converting s and t (I tried s = cos(theta) and t = sin(theta)) to polar, but that didn't work.

Any ideas on how to get started?