The chances are, dear Aperiodical reader, that you’re familiar with the following chain of emotions while browsing Facebook:
A conversation about mathematics inspired by an arbelos. Presented by Katie Steckles and Peter Rowlett, with special guest Catriona Agg.
Catriona mentions this proof without words, which is taken from Proof Without Words: The Area of an Arbelos by Roger B. Nelsen in Mathematics Magazine.
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Long before Catriona Agg’s Geometry Puzzles in Felt Tip Pen were all over Twitter, Ed Southall was doing something similar without felt tips. He and Vincent Pantaloni served up a smorgasbord of Geometry Snacks in 2017 and More Geometry Snacks the following year — but these are aimed at a (chronologically) grown-up market.
Geometry Juniors, as it says on the tin, is aimed at a younger audience. Or rather, it’s aimed at parents or carers of a younger audience; it’s as much for starting conversations about geometry as it is for direct instruction or to bamboozle puzzle-solvers.
