Ellipse Construction, ContinuedDeterminingfociTo determine the foci of an ellipse, strike arcs with a radius equal to half themajor axis and with the center at the end of the minor axis.Another methodis to draw a semicircle with the diameter equal to the major axis of theellipse. Then draw GH parallel to the major axis. Draw GE and HF parallelto the minor axis.Figure 2-46 show how to determine foci.Figure 2-46.—Determining foci.Continued on next page2-46
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