What does the term "perimeter" refer to?

The term "perimeter" specifically refers to the total distance around the outside of a two-dimensional figure. It is calculated by adding the lengths of all the sides of the shape. For example, in a rectangle, the perimeter is found by summing the lengths of all four sides, which can also be calculated using the formula: 2 times the length plus 2 times the width. This concept is essential in geometry as it helps determine the size of the boundary of various shapes, such as squares, rectangles, triangles, and circles. Understanding perimeter is crucial for real-world applications, such as determining the amount of fencing needed for a yard or the border around a garden.

The other options refer to different measurements: area refers to the space contained within a figure, volume pertains to the amount of space inside a three-dimensional object, and angle refers to the space between two intersecting lines or planes. These concepts do not align with the definition of perimeter.