A rectangle is a 4 sided quadrilateral
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A rectangle with four equal sides would not be a rectangle, it would be a square. In a rectangle opposite sides are equal in length and are parallel.
Opposite sides of a rectangle must always be equal.
A square (a by a) and a rectangle (a by b) can have sides that are of equal length.
The set of rectangle includes the set of squares (a special rectangle with all equal sides), and the set of rhombus (a special rectangle with equal non parallel sides).
a square - an equilateral square a rectangle - an equilateral rectangle