EntityQ3235577· pop 10· linked from 37 articleshyperbolic sectorSign in to savetype of region of the Cartesian planeConnectionshyperbolaEntityRussianEntityArchimedesEntityLeonhard EulerEntityInternational Standard Book NumberEntitylineEntityEuler's numberEntitytrigonometric functionEntityright triangleEntityCartesian coordinate systemEntityrotationEntityFelix KleinEntityslopeEntitynatural logarithmEntityhyperbolic functionEntitynon-Euclidean geometryEntityinverse functionEntityvertexEntityAugustus De MorganEntitycircular sectorEntityCategoriesAreaElementary geometryEuclidean plane geometryIntegral calculusLogarithms