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A square. Four 90 degree angles allow a quadrilateral to have equal sides.
A "parallelogram" technically is a shape where opposite sides are equal and any shape with four sides is a "quadrilateral". Every square has four sides of equal length, so a square is both a parallelogram and a quadrilateral. A rhombus(or diamond shape) can have four sides of equal length and can be a parallelogram as well, so either are possibilities.
That quadrilateral is known as a 'parallelogram'.
Quadrilateral means four sides. Four right angles and four sides is a rectangle and if the sides are equal length it is a square.
A quadrilateral has four sides, and the fact that it is equilateral means the sides all have the same length, so the only possible shapes with four sides of equal length are a square and a rhombus.