quadrilateral
Rectangle's geometric family
A quadrilateral is a polygon with four sides and four angles—squares, rectangles, parallelograms, trapezoids, and rhombuses are all quadrilaterals.
The term appears mainly in geometry: Calculate the area of the quadrilateral.
In casual speech, people usually name the specific shape rather than using this umbrella term.
Four-sided, all right angles
- squareRhombus with right angles
- trapezoidPolygon with parallel pair
- rhombusEquilateral parallelogram
- parallelogramQuadrilateral with paired parallels
kite · diamond · trapezium · oblong · lozenge · cyclic · convex · concave
Multisided plane figure
- angleGeometric measure of rotation
- diagonalSlanting line or path
- perimeterShape's outer edge length
- areaExtent of surface
vertex · vertices · side · bisect · congruent · parallel · perpendicular · interior
Invariance under transformation
- congruenceState of agreement
- proportionComparative relation of parts
- parallelEquidistant at all points
- perpendicularAt right angles
equilateral · equiangular · rotation · reflection · tessellation · tiling · bisector · median
rectangle
Four-sided, all right angles
parallelogram · kite · diamond · trapezium · oblong · lozenge · cyclic · convex · concave · irregular
polygon
Multisided plane figure
area · vertex · vertices · side · bisect · congruent · parallel · perpendicular · interior · exterior
symmetry
Invariance under transformation
- congruenceState of agreement
- proportionComparative relation of parts
- parallelEquidistant at all points
perpendicular · equilateral · equiangular · rotation · reflection · tessellation · tiling · bisector · median · altitude
tile
Flat surface-covering piece
door · tabletop · envelope · canvas · billboard · placemat · carpet · pane · checkerboard · court
- geometric shapessphere, triangle, square, cone, rectangle
- polygonspolygon, triangle, pentagon, hexagon, heptagon
- shapescircle, square, triangle, rectangle, oval
- foursfour elements, four directions, four corners, four suits, four horsemen
- squaresperfect square, grid square, magic square, square number, center square
- alliancesalliance, allies, ally, coalition, NATO alliance