Quadrilaterals are classified and identified based on angles and side lengths. While each four sided figure is a quadrilateral, sometimes there is a name that is more specific. A parallelogram is a quadrilateral with opposite sides that are parallel and congruent. Congruent means exactly the same.Click to see full answer. Also to know is, what are the classification of quadrilateral?All angles of a rectangle equal 90°. An equilateral quadrilateral, i.e. the one with all sides equal, is a rhombus. In a square, rectangle, or rhombus, the opposite side lines are parallel. A quadrilateral with the opposite side lines parallel is known as a parallelogram.Additionally, how are Quadrilaterals different? A quadrilateral is a polygon with four sides. Polygons are two-dimensional shapes with straight sides. For example, the square has four sides that are all the same length. The rectangle has two pairs of parallel sides that are different lengths. Also to know, what are the 7 Quadrilaterals? Quadrilaterals – Square, Rectangle, Rhombus, Trapezoid, Parallelogram.What shape is a trapezoid?A trapezoid is a four-sided shape with at least one set of parallel sides. It can have two and be a parallelogram. But, if two sides aren’t parallel, then it’s just the lowly trapezoid. So, in a trapezoid, the parallel sides are called the bases.