TOROIDAL SURFACE
Definition
A <TOROIDAL SURFACE> is an <ELEMENTARY SURFACE> and an <UNBOUNDED FINITE SURFACE>; there is a circle such that the shortest distance from each point in the surface to the circle is the same. The shortest distance from a point in the surface to the circle is the &amp;#39;minor radius&amp;#39;. The radius of the circle is the &amp;#39;major radius&amp;#39;