Osgood, William F. (William Fogg), 1864-1943, Graustein, William Caspar, 1888-1941, joint author · New York, The Macmillan company · leaf 95
is always equal to itsdistance from a fixed point F, not onthe line. It is understood, of course,that P is restricted to the plane deter-mined by D and F. One point of the locus is the mid-pointA, Fig. 2, of the perpendicular FEdropped from F on D. Through Adraw T parallel to D. Then no otherpoint… … Further points ofobtained as follows,draw L parallel toduced if necessary,radius and F as center cutting L in P and Q. Then P and Qlie on the locus. A large number of points having been obtained in this way, smooth curve i F Fig. 2 can be passed through them. The curveis symmetric in the line AF,…
Geometry, Analytic
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