https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circ-challenge/v/area-of-shaded-region 2020-09-16T18:09:55Z Area of a shaded region Here's a fun one: find the area of a shaded region where you first determine the area of a square and then the area of a circle. Sal Khan video https://cdn.kastatic.org/googleusercontent/ewA_GfGHFeHuh06YBoJCmdRj28PUnKIDRUCQjYZ22RvnNyhy2VgbJtg0HZn9btBBWDSibObwz9nJlscnpVnv8lmfiw Area of a shaded region Here's a fun one: find the area of a shaded region where you first determine the area of a square and then the area of a circle. https://cdn.kastatic.org/ka-youtube-converted/gbGghzo7yEM.mp4/gbGghzo7yEM.mp4 91 ***Calcular áreas sombreadas https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-two-dimensional-figures/x790e3ac3e338c450:sectors/a/deriving-the-area-of-a-sector 2021-04-29T07:54:07Z Deriving the area of a sector A sector is a fraction of circle defined by two radii. We can find its area by finding the area of the whole circle,  then by using the central angle measure (in degrees or radians) to find the fraction of the total area that's inside the sector. article