from math import*
from turtle import*

speed(10)
hideturtle()

width(2)
up()
goto(0,-90)
down()
circle(90)

liste_angl=(0,30,45,60,90,120,135,150,180,210,225,240,270,300,315,330)
liste_str=("0 2π","π/6","π/4","π/3","π/2","2π/3","3π/4","5π/6","π -π","7π/6","5π/4","4π/3","3π/2","5π/3","7π/4","11π/6")

x=0
width(1)
color("grey")
down()

while x<=15:
    
    goto(0,0)
    setheading(liste_angl[x])
    forward(90)
    x=x+1

y=0
x=0
color("black")
up()

while x<=4:
    y=-2
    goto(0,0)
    setheading(liste_angl[x])
    forward(90+y)
    write((liste_str[x]))
    x=x+1
    
while 4<x<8:
    y=17
    goto(0,0)
    setheading(liste_angl[x]+12)
    forward(90+y)
    write((liste_str[x]))
    x=x+1
    
while 8<=x<=12:
    y=23
    goto(0,0)
    setheading(liste_angl[x])
    if x==8:
      y=y+13
    forward(90+y)
    write((liste_str[x]))
    x=x+1
    
while 12<x<=15:
    y=14
    goto(0,0)
    setheading(liste_angl[x])
    forward(90+y)
    write((liste_str[x]))
    x=x+1

up()
goto(0,0)
down()
write("0")

up()
goto(22,42)
down()
write("x")

up()
goto(22,-42)
down()
write("-x")

up()
goto(-42,42)
down()
write("x-π")

up()
goto(-42,-42)
down()
write("π-x")