A rectangle :p
Parallelograms are quadrilaterals that have pairs of opposite sides that at parallel to each other.
The only parallelograms with right angles are squares and rectangles. And squares have all congruent sides.
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A quadrilateral with four equal sides but no right angles is a rhombus.
A square has 4 equal sides with 4 right angles.
It is a square that has 4 equal sides and 4 right angles.
Yes because it has four egual right angles if it has four equal sides.
The shape you are looking for is a quadrilateral. If you have a square, all angles MUST be right angles. A parallelogram can also have 4 equal sides in length and parallel sides, but a parallelogram doesn't have right angles.