Choose values of angle θ to go from 0 to 360° and then use x = r*cos(θ) and y = r*sin(θ) where r is the radius of your circle. That's assuming the centre of your circle is at (0,0). If the circle is centred at (xc, yc) you will need to add xc to the x values and yc to the y values.
can you be more precise.
The equation of a circle centred on (0,0) is
x2+y2=r2
Where r is the radius.
Choose values of angle θ to go from 0 to 360° and then use x = r*cos(θ) and y = r*sin(θ) where r is the radius of your circle. That's assuming the centre of your circle is at (0,0). If the circle is centred at (xc, yc) you will need to add xc to the x values and yc to the y values.