Mastodawn

If you squint hard enough, the capital letter pi (Π) looks like half a circle.

Maybe this is why pi was chosen for half of the circumference of a circle.

What is this Cunningham’s law?

Pi is not half the circumference. It’s how many times the diameter fits into the circumference.

It is half of the circumference, multiplied by the radius, of course.

That’s not half the circumference then is it???

Now you’re just being silly.