Points sur cercle tkinter

import math
import tkinter
import numpy
rayon=300
npoints=10
taillepoint=rayon/npoints/5
xcentre=rayon+taillepoint
ycentre=xcentre
x=[ycentre+rayon*math.sin(math.pi*2*i/npoints) for i in range(npoints)]
y=[ycentre+rayon*math.cos(math.pi*2*i/npoints) for i in range(npoints)]
desk=tkinter.Tk()
w = tkinter.Canvas(desk, width=2*(rayon+taillepoint), height=2*(rayon+taillepoint),bd=0,highlightthickness=0)
w.pack()
w.create_oval(xcentre-rayon,ycentre-rayon,xcentre+rayon,ycentre+rayon)
for i in range(npoints):
    w.create_line(x[i],y[i],x[(i+1)%npoints],y[(i+1)%npoints],fill="red")
    w.create_oval(x[i]-taillepoint,y[i]-taillepoint,x[i]+taillepoint,y[i]+taillepoint,fill="blue")

import math
import tkinter
rayon=300
npoints=10
multiplicateur=3
xcentre=rayon+5
ycentre=xcentre
def angle(nombre,npoints):
    return math.pi*(-1/2-2*(nombre%npoints)/npoints)
desk=tkinter.Tk()
w = tkinter.Canvas(desk, width=2*xcentre, height=2*ycentre,bd=0,highlightthickness=0)
w.pack()
w.create_oval(xcentre-rayon,ycentre-rayon,xcentre+rayon,ycentre+rayon)
for i in range(npoints):
    w.create_line(xcentre+rayon*math.cos(angle(i,npoints)),
                  ycentre-rayon*math.sin(angle(i,npoints)),
                  xcentre+rayon*math.cos(angle(i*multiplicateur,npoints)),
                  ycentre-rayon*math.sin(angle(i*multiplicateur,npoints))
                  ,fill="red")