Un losange a une aire égale à 37,5 cm2 et une diagonale qui mesure 10 cm. Donnez la longueur d'un côté de ce losange.
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Le losange : défi géométrique quadrilatère | Tangente
? Le losange

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Both unusual—since it does not usually rest on its "base"—and harmonious, as it is a quadrilateral with four equal sides, the rhombus appeals to graphic artists, advertisers and other designers: it appears in puzzles, games, road signs, logos…

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For the familiar convex quadrilaterals, the classification criteria are, first, whether the sides are parallel, then whether their lengths are equal, and finally whether there are any right angles.

In August 2019, our reader Mustapha Rherrad created a magic rhombus using the integers from 1 to 32, arranged so that the sums along every "slanting row" and every "main diagonal" are equal.