Online calculator which helps you calculate the area and perimeter of a quadrilateral.
A quadrilateral is a geometric figure (polygon) that consists of four points (vertices), no three of which are collinear, and four segments (sides), consistently connecting these points.
Distinguish between convex and nonconvex quadrangles, non-convex quadrilateral can be self-intersecting.
The quadrangle does not intersect itself is called a simple, often under the term "quadrangle" refers only simple quadrilaterals.