"But our square is always the same size - it's always 100!", I hear you say.
And you're right! But we can fix that too!
We can say square 80 but we need a "box" to keep the "80" in.
We can call the box whatever we like - let's call it side.
We have to put a : (colon) in front of the name to let the turtle know it's a box and not a procedure.
So change your "square" procedure so it looks like this: to square :side repeat 4 [forward :side right 90] end and try square 30 square 40 square 50 square 60 Check.

Exercise 12 Change the triangle and hexagon procedures in the same way. Check.