+Principal curvatures quantify the sharpest and gentlest bends a [Surface](/wiki/surface) takes at any given point. These two values, found along orthogonal [Principal Directions](/wiki/principal_direction), precisely characterize the local geometry and how the surface folds.
+## See also
+- [Gaussian Curvature](/wiki/gaussian_curvature)
+- [Mean Curvature](/wiki/mean_curvature)
+- [Curvature](/wiki/curvature)
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