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Tangent Length from a Point to a General Circle
For:
$$x^2+y^2+2gx+2fy+c=0$$
and point $$P(x_1,y_1)$$, the squared tangent length is:
$$PT^2=x_1^2+y_1^2+2gx_1+2fy_1+c$$
Usage
- Used to find tangent length directly without first calculating the centre and radius.
