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Circle in Complex Form
## Formula
A circle with centre $z_0$ and radius $$r$$ is:
$$|z-z_0|=r$$
If:
$$z_0=a+ib$$
then:
$$|z-(a+ib)|=r$$
In Cartesian coordinates:
$$(x-a)^2+(y-b)^2=r^2$$
## Usage
- Used to convert between complex and Cartesian equations of circles.
