Higbee, F. G · New York, John Wiley & Sons · leaf 211
o locate the .foci of theellipse. With P as a center andhalf of MN as a radius drawarcs cutting MN at F andF, the required foci. To draw a tangent to anellipse at a point on thecurve. Let L be the given point.Draw LF and LF, the focalradii. Bisect the exteriorangle between LF and LF and draw the… … APPENDIX 20I b, c, etc., draw horizontal lines; from i, 2, 3, etc., draw verticallines. Locate the intersections of these lines as at i, 2, 3, etc.,and find a sufl&cient number so that a curve may be drawnthrough them as shown. This curve will be the required ellipse. To draw a tangent to an…
Geometry, Descriptive
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