Higbee, F. G · New York, John Wiley & Sons · leaf 213
mber of them havebeen found the curve may be drawn with the irregular curve. 202 ESSENTIALS OF DESCRIPTIVE GEOMETRY To draw a tangent to a parabola at a point on the curve. Let L be the given point. Draw LP perpendicular to AB andmake NA equal to PA. Draw NL; this will be the requiredtangent to the… … gent to the curve. With P as a center and a radius Pf describethe arc cutting the directrix at K and L. From these pointsdraw hnes LM and KN perpendicular to CD cutting the parab-ola at M and N. M and N, then, are the tangent points, andlines drawn from P to these points will be tangent to the…
Geometry, Descriptive
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