叠加等边三角形

import turtle
turtle.setup(650,350,200,200)
turtle.penup()
turtle.fd(-120)
turtle.pendown()
turtle.pensize(6)
turtle.pencolor("black")
turtle.seth(-120)
turtle.fd(120)
turtle.seth(0)
turtle.fd(120)
turtle.seth(120)
turtle.fd(120)
turtle.seth(0)
turtle.fd(120)
turtle.seth(-120)
turtle.fd(120)
turtle.seth(0)
turtle.fd(120)
turtle.seth(120)
turtle.fd(240)
turtle.seth(-120)
turtle.fd(120)