the world > relative properties > number > geometry > shape or figure > [noun] > element of > height
altitude1570
slant height1798
1798 C. HuttonCourse Math. II. 42 To find the Surface of a Pyramid or Cone. Multiply the perimeter of the base by the slant height, or length of the side [etc.].
1873 J. PrydePract. Math. 156 The slant height of a cone.