A square or a rectangle... though technically they have four equal angles...
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It's impossible for a quadrilateral to have no equal sides and have right angles.
There can be at most 3 obtuse angles in a quadrilateral.
A rhombus is a quadrilateral with 4 equal sides and if the angles are also all equal that that rhombus is a square.
rhombus
It is a parallelogramIf one of the angles is a right angle (then they all are) and the quadrilateral is a rectangle.If both pairs of sides are equal in length (but none of the angles is a right angle) the quadrilateral is a rhombus.If the sides are equal and one of the angles is a right angle, the quadrilateral is a square.