11

import turtle
for i in range(10):
    turtle.up()
    turtle.goto(0,-10*i)
    turtle.down()
    turtle.circle(10*i)

 

from turtle import *
fillcolor("yellow")
begin_fill()
while True:
    forward(200)
    right(144)
    if abs(pos())<1:
        break
end_fill()

　　

 

import turtle
for i in range(10):
    turtle.up()
    turtle.goto(0,-10*i)
    turtle.down()
    turtle.circle(10*i)