High Quality Content by WIKIPEDIA articles! In geometry, a conoid is a Catalan surface all of whose rulings intersect a fixed line, called the axis of the conoid. If all its rulings are perpendicular to its axis, then the conoid is called a right conoid.For example, the hyperbolic paraboloid z = xy is a conoid (in fact, a right conoid) with x-axis and y-axis as its two axes. In geometry, a Catalan surface, named after the Belgian mathematician Eugene Charles Catalan, is a ruled surface all of whose rulings are parallel to a fixed plane.

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