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五角形
# turtle graphics (draw of a pentagon)
import turtle as t
t.color('blue')
t.bgcolor('lightcyan')
t.shape('turtle')
t.shapesize(4)
t.penup()
t.width(10)
t.setpos(0,0)
t.setheading(0)
t.pendown()
n=5
for i in range(n):
t.forward(200)
t.left(360/n)
t.penup()
t.setpos (-100,-100)
t.color("red")
t.setheading(90)
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