雙層迴圈 畫出多邊形

import turtle
t=turtle.Pen()
t.penup()
t.clear()
t.setpos(-200,-200)

t.pendown()
for slides in range(3,9):
    angle=360/slides
    for i in range(1,slides+1):
        t.forward(200)
        t.left(angle)

turtle.mainloop()
turtle.bye()