What is the definition of perimeter?

The definition of perimeter refers to the distance around a shape. It is calculated by adding together the lengths of all the sides of a two-dimensional geometric figure. This concept applies to various shapes, including polygons, circles, and others, where understanding the boundary measurement is crucial in both mathematics and real-world applications such as fencing, landscaping, and design.

In contrast, the area within a shape, which focuses on the space enclosed, represents a different concept that quantifies the surface rather than the boundary. The notion of height multiplied by width describes the calculation of area specifically for rectangles and similar shapes. On the other hand, the sum of all angles is a measurement related to the internal angles of a polygon, which is again focused on different aspects of geometry. Thus, the correct understanding of perimeter is specifically related to the distance encircling a shape, making it distinct from these other dimensions and measurements.