star with functions

By ARJUN
#inspired by nadeem(star) 
r= rectangle(x=0,y=0,w=300,h=300,fill="black")
show(r)
def star(size):
    p1 = point(x=-size/2, y=0)
    p2 = point(x=0, y=2*size)
    p3 = point(x=size/2, y=0)
    p4 = point(x=0, y=-2*size)
    shape1 = polygon([p1, p2, p3, p4], fill="silver", stroke="none")
    shape2 = shape1 | rotate(45) 
    shape3 = shape1 | rotate(90)
    shape4 = shape1 | rotate(135)
    return(shape1+shape2+shape3+shape4)
s = star(50)
show(s)