import turtle as t

def side3():
    for i in range(3):
        t.forward(80)
        t.left(120)

def side4():
    for i in range(4):
        t.forward(40)
        t.left(90)

t.setup(960,720)
t.bgpic('starbg.png')
t.pensize(5)
t.fillcolor('yellow')
t.begin_fill()
for i in range(5):    
    side3()
    t.forward(80)
    side4()
    t.goto(0,0)
    t.left(72)
t.end_fill()
t.done()