Perpendicular (horse)
In geometry, two geometric objects are perpendicular if their intersection forms right angle, right angles (Angle, angles that are 90 degrees or π/2 radians wide) at the Point (geometry), point of intersection called a ''foot''. The condition of perpendicularity may be represented graphically using the ''perpendicular symbol'', ⟂. Perpendicular intersections can happen between two lines (or two line segments), between a line and a plane, and between two planes. Perpendicularity is one particular instance of the more general mathematical concept of ''orthogonality''; perpendicularity is the orthogonality of classical geometric objects. Thus, in advanced mathematics, the word "perpendicular" is sometimes used to describe much more complicated geometric orthogonality conditions, such as that between a surface and its ''Normal (geometry), normal vector''. A line is said to be perpendicular to another line if the two lines intersect at a right angle. Explicitly, a first line is p ...
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