Definition of Terms, ContinuedSolids(Continued)Spheres are formed by a circle revolving around its diameter. The diameterof the circle then becomes the axis and the ends of the axis are known aspoles.Figure 2-15 shows a sphere, its axis, and its poles.Figure 2-15.—Asphere.A torus or toroid is formed by a circle or curve revolving around but notintersecting or containing an axis in its own plane.The axis of a torus iseccentric to the diameter of the circle or curve.Figure 2-16 is an example of a torus.Figure 2-16.—A torus.Continued on next page2-17
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