<Tr> <Th> Area </Th> <Td> various methods; see below </Td> </Tr> <Tr> <Th> Internal angle (degrees) </Th> <Td> 90 ° (for square and rectangle) </Td> </Tr> <P> 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 (5 - sided), hexagon (6 - sided) and so on . </P> <P> The origin of the word "quadrilateral" is the two Latin words quadri, a variant of four, and latus, meaning "side". </P>

Polygon with four right angles and four side with the same length