Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 154
ig. 135, let db and eg be the major and minor axes.Draw the inscribedand circumscribedcircles, and theradii oj, ok, etc.Draw verticals jf,kk, etc., and hori-zontals jj, kk,etc. The intersec-tions /, k, etc.,are on the requiredellipse. 125. To draw aTangent to an El-lipse. I. At a Point on the… … 138 DESCRIPTIVE GEOMETRY [Vll, § 125 (2) Second method. In Fig. 133 another construction isshown. Let it be required to draw a tangent to the ellipseat p. Connect p with the foci, z and z. Extend zp to r makingpr equal to pz. Bisect the angle rpz. The bisector pm istangent to the ellipse. The…
Geometry, Descriptive
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