A square must have four sides of equal length, and have a right-angle (90 degrees) in each of the four corners.
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They must all be the same length.
For a figure to be a square, it must have four congruent sides and four right angles. For a figure to be a rectangle, it only has to have four right angles.
The side lengths of a square if its area is 81 meters squared is: 9 meters.
a square
The length of the diagonal of a square whose side lengths are 7 square root 2 (9.89949494) is: 14 units.