is the same before and after the shear. This invariance of slope differences makes slope an angular invariant measure, on a par with circular angle (invariant under rotation) and hyperbolic angle, with invariance group of squeeze mappings. See also Euclidean distance Grade Inclined plane Linear function Line of greatest slope Mediant Slope definitions Theil–Sen estimator, a line with the median slope among a set of sample points References External links interactive Elementary mathematics Analytic geometry Ratios