Right Conoid
A Ruled Surface is called a right conoid if it can be generated by moving a straight Line intersecting afixed straight Line such that the Lines are always Perpendicular (Kreyszig 1991, p. 87). Taking the Perpendicular plane as the 
-plane and the line to be the x-Axis gives the parametricequations
 |  |  | |
 | |  | |
 | |  |
(Gray 1993). Taking
and 
gives the Helicoid.See also Helicoid, Plücker's Conoid, Wallis's Conical Edge
References
Dixon, R. Mathographics. New York: Dover, p. 20, 1991. Gray, A. Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 351-352, 1993. Kreyszig, E. Differential Geometry. New York: Dover, 1991.
- Multiplicative Persistence
- Multiplicative Primitive Residue Class Group
- Multiplicity
- Multiplier
- Multiply Connected
- Multiply Perfect Number
- Multisection
- Multivalued Function
- Multivariate Analysis
- Multivariate Function
- Multivariate Theorem
- Mu Molecule
- Mutant Knot
- Mutation
- Mutual Energy
- Mutually Exclusive
- Mutually Singular
- Myriad
- Myriagon
- Mystic Pentagram
- Méiré Pattern
- Ménage Number
- Ménage Problem
- Möbius Band
- Möbius Function