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Square root of 5 is the dimension h of the square in red dashed lines, because its area is 5. It is also the hypotenuse length of a right triangle of which the perpendicular edges measure 1 and 2: h × h = 1 × 1 + 2 × 2 (Pythagorean theorem).
Racine carrée de 5 est la dimension h du carré en pointillés rouges, dont l’aire est 5. C’est aussi la longueur de l’hypoténuse d’un triangle rectangle dont les autres côtés mesurent 1 et 2 : h × h = 1 × 1 + 2 × 2 (théorème de Pythagore).