perpendicular
Two lines that intersect to form right angles
In geometry, perpendicular refers to two lines, rays, or segments that intersect at a right angle (90 degrees). The word perpendicular comes from the Latin word perpendicularis which means falling straight down.
A line segment that is perpendicular to a given line can be constructed by drawing a straight line that intersects the given line at a 90-degree angle.
Two lines are perpendicular if and only if the product of their slopes is -1. This means that if one line has a slope of m1, then any line perpendicular to it will have a slope of -1/m1.
Perpendicular lines have a number of important applications in mathematics and physics. For example, they can be used to construct right angles, which are important in the computation of geometric shapes such as triangles and rectangles. Additionally, they are used in architecture and engineering to ensure that structures are properly aligned and stable.
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