nothing. that is impossible
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It always has 4 equal sides but not 4 equal angles because it has 2 equal opposite acute angles and 2 equal opposite obtuse angles. The 4 interior angles add up to 360 degrees
This is a rectangle. Each of its vertex angles measures 90°. It does not have 4 equal sides but opposite sides are equal.
A rhombus
a parallogram
A parallelogram