Right conoid
![A right conoid as a ruled surface.](/Images/godic/202502/07/Right_concoid.svg5537.png")
![Generation of a typical right conoid](/Images/godic/202502/07/Conoid5537.gif")
In geometry, a right conoid is a ruled surface generated by a family of straight lines that all intersect perpendicularly a fixed straight line, called the axis of the right conoid.
Using a Cartesian coordinate system in three-dimensional space, if we take the z-axis to be the axis of a right conoid, then the right conoid can be represented by the parametric equations: