pi over 720 radians

[Nusa]

Isn't pi over 720 rads equal to 15 minutes of arc, not 10?
Or is faulty math part of the joke?

[Gav]

Nope, that was just a really embarrassing simple math error on my part. Normally when I do something like that, I can make some lame technical excuse--like the number got inadvertently changed between the script and the drawing, but I went back to my original calculation and it was wrong from the start!

Thanks for the notice. It's fixed now.