Isabella Lewis

One of these squares isn't square. The reason I know this is because when I place the one inside of the other, they're not touching at the ends. So I'm gonna do the 3-4-5 and go 12, 16, 20 with my tape starting at 10. 30 on the 12, minus 10 on the 16 is 20. This one checks out. So it's got to be this one. 12 on the 30 and the 10's off of the 16 a l