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Ruled surface

43 bytes added, 14:50, 5 August 2011
Examples
| [[elliptic hyperboloid of one sheet]] || <math>\frac{x^2}{a^2} + \frac{y^2}{b^2} - \frac{z^2}{c^2} = 1</math> || ||
|-
| [[hyperbolic paraboloid]] || <math>z = \frac{y^2}{b^2} - \frac{x^2}{a^2}</math> || ||This is in fact a [[doubly ruled surface]]
|-
| [[helicoid]] || <math>y = x \tan(z/c)</math> || || it is the only ruled [[minimal surface]] other than the plane.
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