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normals for curved surfaces

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hi, how do I find the normal for a surface that is curved (not necessary perfectly round curve, in my case: cross section looks like a quarter circle). Also, to draw a 2D quarter circle, how i specfiy the coordinates along the arc?

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normal = -(x'(t))/(y'(t))

if an equation find the derivitave
otherwise use the definition of derivative:

f'(x) = lim ((f(x+h)-f(x))/h) as h becomes epsilon


Dick's Lemma:
"Just because you`re paranoid doesn`t mean they`re not out to get you."

The Programmer's dilemma:
"Programming is like sex: One mistake and you're providing
support for a lifetime."

[edited by - caesar4 on January 6, 2004 10:26:08 PM]

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