Accreditation is a process in which school standards are evaluated by an accreditation agency. In the United States, this process is not completed by the federal government, but by states or private companies with varying rules and standards. Different groups promote accreditation for homeschoolers.
The circle is the simplest and best known conic section. As a conic section, the circle is the intersection of a plane perpendicular to the cone's axis. The geometric definition of a circle is the locus of all points a constant distance r {\displaystyle r} from a point ( h , k ) {\displaystyle (h,k)} and forming the circumference (C).
However, if any line segment falls outside the shape or set, then it is regarded to be non-convex. A solid cube is an example of convex, whereas a crescent shape is non-convex (concave). The concept of convex and non-convex has also been extended to functions and variables to solve the related problems.