How is linear measurement defined?

Linear measurement is defined as the distance between two points, which involves measuring the straight distance along a line connecting those points. This concept is fundamental in various applications, including construction, surveying, and engineering, where determining accurate distances is essential for planning and implementation.

When considering the other definitions, the measurement of a three-dimensional space pertains more to volume rather than linear measurement, which focuses solely on the distance between points. Measuring the distance along a curve involves considering not just the two endpoints but also the path taken, making it distinct from linear measurement. The area within a shape refers to a two-dimensional concept, measuring how much space is contained within the boundaries of a shape rather than the distance between points. Therefore, the correct definition encapsulates the straightforward essence of linear measurement as a simple and direct distance.