function to create regular polygon

[gilboonet]

Hello, I'm making a design made from a polyhedron and am needing to make regular polygons having same side length. I have a V1 script to do that and before to port it to V2, I was wondering whether it could be done straightly using
a function to compute the radius depending on the side length and the number of segments.
Do you thing such function is possible ?

function RegularPolygon(sideLength, sidesCount){
  let R = ...
return circle ({radius: R, segments: sidesCount})
}

But on the other side, maybe is it better to stop using the segment trick, and by the way, I remember that there is star(), but isn't there it's counterpart that would create regular polygon ?

[gilboonet]

@hrgdavor Thanks a lot that's exactly what I needed,

[hrgdavor]

@gilboonet not sure if this is what u need

α angle of the triangle is Math.PI/sidesCount in radians or 360/sidesCount/2 in degrees
red line is A = Math.sin(α)
blue line is A=Math.cos(α)
the radius you are looking for the circle isR=1 in this drawing

R=sideLength/2/Math.sin(α)
or
sideLength=(R*Math.sin(α)) * 2

const jscad = require('@jscad/modeling')
// https://openjscad.xyz/docs/module-modeling_primitives.html
const { circle } = jscad.primitives

function main({// @jscad-params
	sideLength = 15,
	sidesCount = 6,
}){
	let alpha = Math.PI / sidesCount
	let R = sideLength/2/Math.sin(alpha)
	// R === sideLength in case of sideCount=6 (hexagon)
	console.log('R',R)
	return circle({radius:R, segments: sidesCount})
}

module.exports = {main}