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 also the 2-dimensional analogue of a cube.
If the length of side a is known, then we have that:
|Length of diagonal|
If the length of diagonal d is known, then we have that:
|Length of side|
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