4.1.4 Dartboard

radius = 25
def lil_circle():
    circle(radius)
lil_circle()
for i in range(1):
    penup()
    right(90)
    forward(20)
    left(90)
    pendown()
    circle(50)
    penup()
    right(90)
    forward(20)
    left(90)
    pendown()
    circle(75)
    penup()
    right(90)
    forward(20)
    left(90)
    pendown()
    circle(100)