Square (geometry)
E l regular ring, ie a quadrilateral with all sides congruent (equal) and the four interior angles straight (same). This is a parallelogram because opposite sides are parallel.
A square is determined by the length of its side.
The area of \u200b\u200ba square of side l is A = a 2.
The two diagonals of a square are congruent (equal) angles 90 ° and measure 
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