Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 71
Fig. 2t of one touch the otlier at L and cut IJ in M, then L, Mharmonically separate P, Q. Example 3. If A he a fixed ijoint on a circle, and if PQ he achord subtending a constant angle at A, then PQ willenvelope a circle concentric with the given circle. … Fig. 26. Generalisation. If A he a fixed point on a conic, I and J tivo otherfixed points, and if AP, AQ he two variable chords such THE CONIC 61 that A[PIQJ] is constant, then will PQ envelope a conictouching the original conic at I and J. Example 4. If P he a 2^oint on the directrix to a…
Geometry, Projective
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