périmétrie

Périmétrie is a term derived from the French word "périmètre," which means "perimeter" or "circumference." In mathematics, the périmétrie of a shape refers to the distance around the outside of the shape. It is a fundamental concept in geometry and is used to describe the boundary length of two-dimensional figures. For example, the périmétrie of a circle is known as its circumference, which is calculated using the formula C = 2πr, where r is the radius of the circle. The périmétrie of a polygon, such as a square or triangle, is the sum of the lengths of its sides. Calculating the périmétrie is essential in various fields, including architecture, engineering, and physics, where it is used to determine the total length of boundaries, the amount of material needed for construction, or the path of objects in motion. Understanding périmétrie is crucial for solving problems involving shapes and their properties.