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my professor didn't cover this material that well so I'm not sure how to do this one. the question is: Find an equation of the tangent plane to the parametric surface $x=2r\cos\theta$, $y=5r\sin\theta$, $z=r$, at the point $(2\sqrt2$, $5\sqrt2$, 2) where $r = 2$ and $\theta = \pi/4$

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    [Example 3 here](http://tutorial.math.lamar.edu/Classes/CalcIII/ParametricSurfaces.aspx) might help.2011-12-18
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    @Dylan I love his site; overall, the best student-centered, first/second year math courses site I've encountered on the web.2011-12-18

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