Formula
$$\begin{aligned} x &= a + R\cos t \\ y &= b + R\sin t \\ \end{aligned} ~~~~~~ 0 \le t \le 2\pi $$
Variables
R
→
Radius of a circle
(a,b)
→
Ceter of a circle
$$\begin{aligned} x &= a + R\cos t \\ y &= b + R\sin t \\ \end{aligned} ~~~~~~ 0 \le t \le 2\pi $$