Smart, Edward Howard · London : Macmillian and Co. · leaf 193
{a) Let the feet of the perpendiculars from the foci S, S onthe tangent be Y, Y (Figs. 85a and h). Let SY meet SP inK, and the circle again in L. Then, since angle SPY = angle YPK by §2, and the anglesat Y are right angles, and PY common, SY = YK and SP= PK. ButSC = CS. .. CY||SK and = iSK. TANGENT… … Fig. 85ct.
Geometry, Projective
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