The Frenet–Serret formulas calculate derivatives taken with respect to this quantity. Elliptic integrals were developed to calculate this quantity for ellipses. (20[1])This quantity is approximated as the sum of the distances between adjacent values in a partition of the domain and may equal the supremum of all such rectifications. A function “parameterized (*) by” this quantity has a tangent vector whose magnitude is uniformly one and whose derivative equals the curvature. In Cartesian coordinates, the differential of this quantity equals the square root of d x squared plus d y squared and is denoted d s when performing a line integral. For 10 points, name this quantity equal to the distance between two points along a section of a curve. ■END■