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                            #### 3.正方形
繪制如下圖形，邊長80
![](http://h.yiniuedu.com/faa8268a2d68218bec1f8bade2683746)
```
from turtle import *
setup(600,400)
title("正方形")
penup()
goto(-100,32)
pendown()
begin_fill()
for i in range(4):
    forward(80)
    right(90)
end_fill()
hideturtle()
done()
```


使用 turtle 庫的 turtle.fd() 函數和 turtle.seth() 函數繪制一個邊長為 200 的正方形，效果如下圖所示。
![](http://h.yiniuedu.com/be318ae03cf3b4f91e39bef567106669)
```
import turtle
d?=?0
for i in range(4):
    turtle.fd(200)
    d=d+90
    turtle.seth(d)
turtle.done()
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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