In geometry, a set of points that satisfy a specific condition or property is known as a locus. This collection of points can form a line, curve, surface, or even a more complex geometric figure. For instance, the set of all points equidistant from a single, fixed point in a plane forms a circle; the fixed point is the center, and the constant distance is the radius. Similarly, the set of all points equidistant from two distinct points forms the perpendicular bisector of the line segment joining those two points.
Understanding the concept is fundamental in various fields, including mathematics, physics, and engineering. It provides a powerful tool for defining and analyzing geometric shapes and their properties. Historically, the study of such point sets dates back to ancient Greek mathematicians, who used geometric constructions to determine these figures, laying the groundwork for further advancements in geometry and related disciplines. The ability to describe shapes through defined constraints allows for precise analysis and construction of complex forms.