Four sides, meeting pairwise at four vertices.
Sum of interior angles = 360 degrees.
Two diagonals.
Most other properties are either those of all polygons, or of special cases of quadrilaterals.
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it depends on the other diffrent properties of the shape * * * * * A quadrilateral. If you have more information about the properties of the shape, there may be a more precise name, but a quadrilateral is the general name.
A cyclic quadrilateral is one that has concyclic vertices (its corners all fit on the same circle) and, for a simple cyclic quadrilateral, opposite angles are supplementary.
A rectangle is a special kind of quadrilateral that has four right angles and opposite sides that are equal and parallel.
The essential properties are that a rectangle is a quadrilateral whose sides met at right angles. There are many other properties but all of them follow from this.
All quadrilateral shapes are polygons with four sides. The sum of the interior angle of the quadrilateral always add up to three hundred and sixty degrees.