Vector which is perpendicular to said surface or manifold. In a inner product space, the inner product of the normal vector with all vectors which comprise the surface is 0.
... is 481.1/km² (1,246.0/mi²). There are 23,525 housing units at an average density of 212.1/km² (549.3/mi²). The racial makeup of the city is 74.65% ...