Perpendicular

Perpendicular refers to two lines, lines, or surfaces that meet at a right angle, which is exactly 90 degrees. Think of the corners of a standard sheet of paper or a box—they form right angles. When two lines are perpendicular, they intersect in such a way that they create four right angles at the point of intersection. This concept is fundamental in geometry and helps in understanding shapes, angles, and spatial relationships, ensuring structures are properly aligned and measurements are accurate.