Quadrilateral facts for kids
Quadrilateral  

Some types of quadrilaterals


Edges and vertices  4 
Schläfli symbol  {4} (for square) 
Area  various methods; see below 
Internal angle (degrees)  90° (for square and rectangle) 
In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5sided), hexagon (6sided) and so on.
The word "quadrilateral" is derived from the Latin words quadri, a variant of four, and latus, meaning "side".
Quadrilaterals are simple (not selfintersecting) or complex (selfintersecting), also called crossed. Simple quadrilaterals are either convex or concave.
All nonselfcrossing quadrilaterals tile the plane by repeated rotation around the midpoints of their edges.
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Quadrilateral Facts for Kids. Kiddle Encyclopedia.