A rhombus or a parallelogram
Any polygon with 2n sides (n integer) where opposite sides are parallel, will have its opposite angles congruent.
A pallelogram or rhombus
parallelogram
An interior angle is an angle defined by two sides of a polygon and that is inside the polygon. Opposite interior angles are specific pairs of interior angles, those that are opposite each other in the polygon. Alternate or opposite interior angles are also angles that lie on opposte sides of the tranversal line that cuts through parallel lines.
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
A square or a rectangle
an irregular polygon is a polygon that is the opposite of a regular polygon in a regular polygon the sides are the same and the angles are the same and irregular is the opposite.
The picture you are looking for is a parallelogram.
The given description fits that of a square which has 4 equal sides, opposite sides are parallel and it has 4 interior right angles
A square and a rectangle both fit the description
triangle