Circles can have parts {arc, circle} greater than semicircles {major arc} or less than semicircles {minor arc}. Arcs subtend central angle. Area subtended by circle arc = 0.5 * r^2 * A, where A is angle in radians, and r is radius. Arc length s equals radius r times angle A in radians: s = r*A. In two different circles, for same angle, arc-length ratio is proportional to radii ratio.
Mathematical Sciences>Geometry>Plane>Circle
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224