Power of a Point Using Circle Equation

Rarely Tested

Power of a Point Using Circle Equation

For:

$$S=x^2+y^2+2gx+2fy+c$$

the power of point $$(x_1,y_1)$$ is:

$$S_1=x_1^2+y_1^2+2gx_1+2fy_1+c$$

Usage

- Used to calculate the power of a point directly from the circle equation.

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