Answer: Turtle Challenge #107

Here’s what the code from Turtle Challenge #107 draws. This picture was made by running the code for real.

The answers

How many points will the star have? 18 points. The turtle draws 18 lines and makes a sharp point at every turn.

How far does the turtle turn altogether? 18 × 100 = 1800 degrees. That’s 5 whole turns, so the star closes up neatly.

How the code works

Turning by a big angle like 100 degrees makes the turtle cross back over its own lines, which makes a star instead of a plain shape. Because 18 × 100 is an exact number of full turns (5), the turtle ends up back at the start.

import turtle

t = turtle.Turtle()
t.speed(0)
t.pensize(3)
t.pencolor("hotpink")

for point in range(18):
    t.forward(220)
    t.left(100)

t.hideturtle()
turtle.done()