👉 In mathematics, a "crenelet" is a shape that appears in the plane of a square. It is named after Pierre de Crennert, who first described it in 1824. A crenelet is an equilateral triangle with side length equal to the side length of the square. This shape occurs when the square is divided into four smaller squares and each of these smaller squares is rotated around its center point, resulting in a new square that has the same number
