turtle复习，试着用turtle画一个有颜色填充的三角形！

加深学习turtel:画一个有颜色填充的三角形吧！

import turtle
turtle.hideturtle()
turtle.speed(5)
turtle.penup()
turtle.pendown()
turtle.write("A")
turtle.begin_fill()
turtle.forward(200)
turtle.dot(5)
turtle.penup()
turtle.goto(205,0)
turtle.pendown()
turtle.write("B")
turtle.penup()
turtle.goto(200,0)
turtle.pendown()
turtle.left(90)
turtle.forward(200)
turtle.dot(5)
turtle.penup()
turtle.goto(202,202)
turtle.pendown()
turtle.write("C")
turtle.penup()
turtle.goto(200,200)
turtle.pendown()
turtle.left(135)
turtle.forward(282)
turtle.dot(5)
turtle.end_fill()
turtle.penup()
turtle.goto(50,-50)
turtle.pendown()

turtle.write("比较标准的一个三角形")
turtle.done()