A unit circle is any circle whose radius is $1$, and is used and a base simplification for any circle. Using [[Coordinate System|coordinates]] of the [[Cartesion Plane]] whose origin is the center of this unit circle, the set of all points in that circle are equal to: $\huge \begin{align} C_{1} &= \setbuild{ (x,y) \in \R \times \R }{x^{2}+y^{2}=1}\\ \end{align}$ ![[../../00 Asset Bank/Pasted image 20251009003044.png|invert_B]]