Find the symbol: the hidden geometry of the cards
Build 57 cards with 8 symbols each and exactly one match in every pair: finite projective planes, modular arithmetic and a step-by-step proof.
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Geometry
One extra metre: the rope around the Earth
A rope encircles the Earth. Add one metre: how far does it rise? A surprising result that does not depend on the radius.
ReadOne chord is enough: finding an annulus area with Pythagoras
A 20 cm tangent chord determines an annulus area without either radius. Diagram, proof, general formula, and exercises with hidden solutions.
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