This is an old one, but brought up again by Patrick Vennebush in a mathprank post. Wanted to dynamicize it by making the table customizable, and animating the check comparison. If you know which table is larger, see the gif below. Sketch is at GeoGebraTube.
Matt Shlian: Murq. ball point pen and paint pen 19 x 24 inches 2007.
Wash Series 6. contact paper on arches, 24 x 19 inches 2010.
Ara117 Apo. Paper 19 x 40 x 1/2 2013.
Quick version of the classic paradox I made up for class since we’re discussing infinity today. What’s wrong with the picture?
Edit: GGB sketch, by request.
Archimedes’ Twin Circles
String Art in class today, so I wanted to make a simpler tool for my intro to math students. On GeoGebraTube.
EDIT: looks like the animated version isn’t animated. Sigh.
Trig Ref GGB
In related news, @JoeKargula found this nice GeoGebra trig activity on the Pythagorean Identities by HaileyMF.