Polar of a Point

Rarely Tested

Polar of a Point

For circle:

$$x^2+y^2+2gx+2fy+c=0$$

the polar of $$(x_1,y_1)$$ is:

$$xx_1+yy_1+g(x+x_1)+f(y+y_1)+c=0$$

Usage

- Used to find the polar line of a point with respect to a circle.

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