Regular quadrilateral / From Wikipedia, the free encyclopedia
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In Euclidean geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, π/2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length adjacent sides. It is the only regular polygon whose internal angle, central angle, and external angle are all equal (90°), and whose diagonals are all equal in length. A square with vertices ABCD would be denoted ABCD.
|Edges and vertices||4|
|Symmetry group||Dihedral (D4), order 2×4|
|Internal angle (degrees)||90°|
|Properties||Convex, cyclic, equilateral, isogonal, isotoxal|