Change the variable sliders and it will calculate the rest! It makes all sides equal, all angles equal, and calculates the radius and diameter. 360 sides is a perfect circle.
I made this myself, using some maths to calculate the shapes. Here is the maths if you want: Angles = (Sides - 2 * 180)/Sides LPS = Perimeter/Sides Code: Repeat (Sides) { move (LPS) steps turn > (180 - Angles) Degrees }