from turtle import *
import math

# Name your Turtle.
t = Turtle()

# Set Up your screen and starting position.
setup(500,300)
x_pos = -250
y_pos = -150
t.setposition(x_pos, y_pos)

### Write your code below:
pendown()
for i in range(4):
 forward(100)
 right(90)
circle(50, 360, 6)
penup()

# Close window on click.
exitonclick()
