Convex - Concave polygons, functions

Polygons

• CONVEX POLYGON - the segment connecting any two interior points runs inside the polygon
• CONCAVE POLYGON - there are at least two points whose connecting segment goes outside the polygon

Functions

• CONVEX FUNCTION  - a function is convex if its tangent passes everywhere under the curve of the function
• CONCAVE FUNCTION  - a function is concave if its tangent passes everywhere above the curve of the function