Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 116
94. Chord of Contact. The polar l of any outside point P withrespect to a given circle passes through the points of contact Ci, C^ ofthe tangents draicn from P to the circle. To prove this we have only to show that if C\ is one of the points ofintersection of the polar I of P with the circle, then… … Fig. o9 where a= OCi. It follows that ^ OC\P = OPCl = ^TT. The rectilinear segment CiCo is sometimes called the chord of contactof the point P. We have therefore proved that the chord of contact ofany outside point P lies on the polar of P. It follows that the equations of tlip tangents that can he…
Geometry, Analytic
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