Square
Or a rectangle, which also has 4 sides and 4 90 degree angles.
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Angles are measured in degrees, not sides.
Any quadrilateral with two sets of parallel sides is called a parallelogram.
When all the vertices of a plane quadrilateral are exactly equal to 90 degrees it is is called a rectangle and, if all its sides are of equal length, that rectangle is called a square. So when a plane quadrilateral has all its vertices exactly equal to 90 degrees, but it does not have all its sides equal in length, it must be a rectangle but not a square.
Because it is a regular 4 sided quadrilateral having 4 equal sides and 4 equal interior angles each measuring 90 degrees.
A kite is a quadrilateral having 4 sides and its 4 interior angles add up to 360 degrees