👉 Sides, in the context of mathematics, particularly in geometry and trigonometry, refer to the three lines or planes that intersect at a single point. These lines can be in two-dimensional (2D) spaces, like the sides of a triangle, or in three-dimensional (3D) spaces, such as the sides of a triangle formed by extending lines through points in space. Each side has a unique length and orientation, and they define the shape and size of geometric figures like triangles, quadrilaterals, and polyhedra. Understanding sides is crucial for calculating distances, angles, and areas in these figures, and forms the foundation for more advanced mathematical concepts like vectors, coordinate geometry, and trigonometric identities.