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 .^{[1]}^{[2]}
A square is a type of rectangle with all sides of equal length. However, while a square is a type of rectangle and rhombus,^{[3]} 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:^{[2]}
Perimeter | |
Area | |
Length of diagonal |
If the length of diagonal d is known, then we have that:
Length of side | |
Perimeter^{[4]} | |
Area^{[4]} |
Related pages
References
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