# face.py
# Draw a face using functions.

from turtle import *

def circle_at(x, y, r):
    """Draw circle with center (x, y) radius r."""
    penup()
    goto(x, y - r)
    pendown()
    setheading(0)
    circle(r)

def eye(x, y, radius):
    """Draw an eye centered at (x, y) of given radius