zhaowei -编程的颜色，弧线，线的粗细，坐标系，圆

import turtle
# forward --> fd   left ---》lt    right----> rt
# 颜色 color 绿色 green
turtle.color("green")
# pen 钢笔  size 大小  pensize
turtle.pensize(8)
turtle.lt(45)
turtle.fd(400)
turtle.rt(90)
turtle.fd(400)
turtle.rt(135)
turtle.circle(100)
turtle.fd(570)
# 圆形 circle

# 抬笔 up
turtle.up()
# goto
turtle.goto(-300, 300)
# 落笔 down
turtle.down()



turtle.circle(100)
turtle.fd(200)
# 圆弧 circle(半径，角度)
turtle.circle(50,180)

turtle.done()


# 两条短边和一条长边
# 3   4   5
# 9  + 16  =   25
# 1600 + 1600 = 57*57
# 勾股定理


# 弧线
# 颜色
# 粗细
# 坐标