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Sunday, December 7, 2008
Combined equation of pair of tangents drawn from a point (x1,y1) to a circle
The equation for pair of tangents from the point (x1,y1) to the circle x² + y²+2gx+2fy+c = 0 is given by
(x² + y²+2gx+2fy+c) (x1² + y1²+2gx1+2fy1+c) = (xx1 + yy1 +g(x+x1)+f(y+y1) +c) ²
Expressed as SS’ = T²
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