Carpeted Rectangles

Earlier today, I was looking at the carpet on my living room floor and I saw what appeared to be three similar quadrilaterals, more specifically rectangles.

I then took a picture of it and uploaded it to sketchpad to prove Theorem 5-12, which states that the diagonals of a rectangle are congruent. I measured the lengths and proved that it was a rectangle and then proved that the diagonals were congruent.

(~WM5)