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Right Conoid


A ruled surface is called a right conoid if it can be generated by moving a straight line intersecting a fixed straight line such that the lines are always perpendicular (Kreyszig 1991, p. 87). Taking the perpendicular plane as the xy-plane and the line to be the x-axis gives the parametric equations

x(u,v)=vcostheta(u)
(1)
y(u,v)=vsintheta(u)
(2)
z(u,v)=h(u)
(3)

(Gray 1997). Taking h(u)=2u and theta(u)=u gives the helicoid.


See also

Helicoid, Plücker's Conoid, Wallis's Conical Edge

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References

Dixon, R. Mathographics. New York: Dover, p. 20, 1991.Gray, A. Modern Differential Geometry of Curves and Surfaces with Mathematica, 2nd ed. Boca Raton, FL: CRC Press, pp. 450-452, 1997.Kreyszig, E. Differential Geometry. New York: Dover, 1991.

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Right Conoid

Cite this as:

Weisstein, Eric W. "Right Conoid." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/RightConoid.html

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