It is a square or a rectangle where each interior angle is a right angle of 90 degrees.
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A rectangle, or could be a square if lengths are the same.
A regular quadrilateral is a square and each angle is 90 degrees (i.e. a right angle).
A quadrilateral can have four right angles.
Quadrilateral means four sides. Four right angles and four sides is a rectangle and if the sides are equal length it is a square.
It is just an irregular quadrilateral.