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Normal (geometry)
In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. For example, in two dimensions, the normal line to a curve at a given point is the line perpendicular to the tangent line to the curve at the point. A normal vector may have length one (a unit vector) or its length may represent the curvature of the object (a curvature vector); its algebraic sign may indicate sides (interior or exterior). |
The normal to a circle is a straight line drawn at 90∘ to the tangent at the point where the tangent touches the circle. The normal always passes through the centre of the circle. |
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