三角形

import turtle
for i in range(3):
    turtle.seth(i * 120)
    turtle.fd(100)
turtle.done()

矩形

import turtle
angle = 90
for x in range(4):
    turtle.fd(100)
    turtle.seth(angle)
    angle += 90
turtle.done()

五边形

import turtle
angle = 360/5
for x in range(5):
    turtle.fd(100)
    turtle.seth(angle)
    angle += 360/5
turtle.done()

六边形

import turtle
angle = 60
for x in range(6):
    turtle.fd(100)
    turtle.seth(angle)
    angle += 60
turtle.done()

4个同心圆，最小的圆半径为10，半径差为40

import turtle
r = 10
d = 40

for i in range(4):
    turtle.pendown()
    turtle.circle(r)
    turtle.penup()
    turtle.seth(-90)
    turtle.fd(d)
    turtle.seth(0)
    r += d
turtle.done()

绘制一个五角星，边长为 100

import turtle
d = 100
angle = 180 - 180/5 # 五角星内角为180-36=144度

for i in range(5):
    turtle.fd(d)
    turtle.right(angle)

turtle.done()

绘制一个边长为200的菱形，4个内角度数为2个60度和2个120度

import turtle as t
angle1 = 60
angle2 = 120

t.right(-30)

for i in range(2):
    t.fd(200)
    t.right(angle1)
    t.fd(200)
    t.right(angle2)
t.done()