Instructional Video
Khan Academy

Khan Academy: Calculus: 2011 Calculus Bc Free Response #3A

9th - 10th
Video shows how to use integrals to write a formula for the perimeter of an area bounded on one side by a function. Includes showing how to derive the arc length formula. [5:41]
Instructional Video
Khan Academy

Khan Academy: Calculus: 2011 Calculus Bc Free Response #1D

9th - 10th
Video shows how to derive the arc length formula and how to use it to determine the total distance a particle traveled during a given time interval. [8:34]