1

for _ in range(4):  
    turtle.forward(200)  
    turtle.left(90)
turtle.penup()

2

for _ in range(4):  
    turtle.forward(200)  
    turtle.left(90)
turtle.penup()

3

for _ in range(20):  
   turtle.forward(200)  
   turtle.left(170)

4

import turtle as t
r = 50
#head = 180
n = 50
for i in range(2):
    t.penup()
    t.goto(0,n)
    t.pendown()
    t.seth(180)
    t.circle(r)
    r = r + 50
    n = n + 50