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Normal to a Circle at a Point
For:
$$(x-h)^2+(y-k)^2=r^2$$
the normal at $$(x_1,y_1)$$ is the line through $$(h,k)$$ and $$(x_1,y_1)$$.
$$\frac{y-y_1}{x-x_1}=\frac{y_1-k}{x_1-h}$$
Usage
- Used to find the normal equation at a specified point on a circle.
