Ellipse Construction, ContinuedParallelogramThe parallelogram method of constructing ellipses inscribes the ellipse withinellipsesa parallelogram. You may use conjugate diameters or the major and minoraxes to formulate the parallelogram so long as the sides of the parallelogramare parallel to the diameters or axes.To draw an ellipse by the parallelogram method, use this table;Step1ActionGiven the major and minor axes or the conjugate diameters AB andCD, draw a rectangle or parallelogram . Make sure all sides areparallel to their respective sides.2Divide the distance between AO and AJ into the same number ofequal parts.3Starting at the ends of the minor axis CD, lightly draw straight linesthrough each point. The lines intersect forming the circumferenceof the ellipse.4Lightly sketch the outline of the ellipse. Darken the outline usingfrench curves.Figure 2-51 illustrates the procedure for drawing an ellipse inscribed within aparallelogram.Figure 2-51.—Theparallelogram method.2-53
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