03:10
Angles, Arcs and Sectors: Angles, Circles and Sectors
This clip looks at the sector, a fraction of a circle's area formed by a central angle and its arc. "We can find the area of a sector," the clips explains, "
by multiplying the ratio of the central angle to the circle by the area of the circle."
06:36
Angles, Arcs and Sectors: Angles, Circles and Arcs
This clip includes several practical problems in its discussion of angles in circles. It also explains how to find the length of an arc.