,= Kl- - KP\ 92 Analytical Geometry. Hence when (x, y) is a point external to the circle.T-+ ?/-+ 2^x-+ 2% + C = 0, the expression x-^-i/^lAx■i-2By-\-C is the square of the tangent from {x,y) tothe circle. … If the point T[x, y) be within the circle, in like manner x^ + y~ + 2Ax + 2By+C = KT^-KP\ = - (KP^ - KT%= - PT\PT being the chord which is bisected at T, and theangle PT^ being therefore a right angle (§46, i). Hence in this case ic^ + y2 ^ 9Ax + 2By + 0 is the squareof half the chord bisected at…
Geometry, Analytic
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