A rectangle with no sides is no longer a rectangle as a rectangle HAS 4 sides.
The x-y plane is an infinite flat area with no limits (sides) to it.
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The answer is no, if a rectangle's sides were congruent, it would be a square not a rectangle.
cube has 6 sides and a rectangle has four sides
what are the sides of a rectangle
2d rectangle has 4 sides.
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.