Ellipse ConstructionIntroductionAlthough ellipse templates greatly reduce construction time for an ellipse,you should know how to construct an ellipse using other methods. You mayuse the foci, trammel, concentric diameter, conjugate diameter, orcircumscribed parallelogram method of ellipse construction.EllipsesAn ellipse is created by moving a point so that the sum of its distances fromtwo points (the foci) is constant and equal to the major axis. The foci serveas focal points for the rotation of the circumferential points. The major axisis its longest diameter. The shortest diameter is the minor axis. The ellipsesformed is a basic, uniform, noncircular, closed curve. An ellipse may alsobe a conic section if formed by an oblique cutting plane on a solid.Figure 2-45 shows ellipse terminology.Figure 2-45.—Ellipse terminology.Continued on next page2-45
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