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Quadrilaterals that don't come up short on area!
While the formula for the area of an arbitrary triangle has been known for a long time, that of an arbitrary quadrilateral took longer to emerge. Yet the two formulas share a kinship — visual, if nothing else — that is quite fascinating.
Peano by his great-niece | Tangente
Alongside official biographies, family accounts offer other glimpses into figures known mainly through their work. Lalla Romano, the celebrated Italian author, bears witness to her intellectual closeness with her great-uncle, Giuseppe Peano.
Mathematics at school | Tangente
Worrying results show that attainment among young French pupils continues to decline, and new baccalauréat examinations in the penultimate year of high school aim to rekindle high school students' enthusiasm for mathematics.
Un peu d’air ! | Tangente
Le nageur | Tangente
Le pluviomètre | Tangente
Le « parc poules » de Ti Coq et Ti Jean | Tangente
Le chèvrefeuille - Problème de maths | Tangente
Pourquoi faire simple ? | Tangente
Araneida Dreiecka | Tangente
Le bateau de pêche | Tangente
Affaire de logique ‒ Tout est faux ? | Tangente
Mes problèmes préférés - Michel Broué | Tangente
Le mathématicien René Cori soumet ses collègues à la question : quels sont vos problèmes préférés et pourquoi ?
Des cubes à retourner | Tangente
Le flexatube est un cube auquel on a enlevé deux faces opposées. Flexer l’objet consiste à essayer de le retourner comme une chaussette.
Des casse-têtes à gogo | Tangente
Toutes les bases de la bonne mathématique... | Tangente
Toutes les bases de la bonne mathématique... | Tangente