Square

A square is a shape with four equal sides and four corners that are all right angles (90 degrees). The diagonals of a square also cross at right angles. The angle between any diagonal and a side of a square is 45 degrees. A square has rotational symmetry of four. It has four lines of regular symmetry. A square with vertices A, B, C and D can be written as .

A square is a type of rectangle with all sides of equal length. However, while a square is a type of rectangle and rhombus, the opposite does not need to be true.

A square is also the 2-dimensional surface of a cube.

 Formulas 
If the length of side a is known, then we have that:

+PerimeterAreaLength of diagonal

If the length of diagonal d is known, then we have that:

+Length of sidePerimeterArea

 Related pages 

 Square (algebra)
 Square number
 Square root

References

Category:Polygons
Category:Basic English 850 words