Perpendicularity is a geometric relationship between two lines, segments, or planes that intersect at a right angle (90 degrees). This concept is crucial in various fields of mathematics and physics, especially when dealing with vectors. In the context of tangent and normal vectors, perpendicularity indicates that the normal vector at any point on a curve is orthogonal to the tangent vector at that same point, which plays a vital role in understanding motion and curvature.
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