That is called a rectangle.
It is a square or a rectangle where each interior angle is a right angle of 90 degrees.
a square or a rectangle
A rectangle or a square.
A square or a rectangle
A Square and a Rectangle. NOT a parallelogram, nor a rhombus, nor a kite. nor a trapezium.
A rectangle, or perhaps a square.
A square or a rectangle
rectangle
A rectangle, or could be a square if lengths are the same.
Either a square or a rectangle
Can be a Parallelogram, a Rhombus, A Kite, or a Trapezium. However, A kite may display one right angle, depending on its angular measure. An Asymmetric Trapezium may also display two adjacent right angles. A Symmetric Trapezium does NOT have any right angles. NB A Square has four right angles. A RECTANGLE has four right angles. The word 'Rectangle' is from its Latin base , meaning 'Right(rect) Angles).
A regular quadrilateral is a square and each angle is 90 degrees (i.e. a right angle).