it is a parallelogram or a trapezoid
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A rectangle is a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides. A square is a plane figure with four equal straight sides and four right angles. A rhombus is a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
Sides cannot be right angles whatever the figure because sides are sides and not angles, the answer you are looking for is a rhombus.
A plane figure with three straight sides and three angles.
No
A rectangle is a quadrilateral, which is a plane figure bounded by four straight sides. Both opposite pairs of sides are equal in length and all four vertices are right angles.