Quadrilaterals are type of polygon with 4 straight lines joined together at their ends. They are classified as 2-dimensional\r\n shapes. The total sum of angles in a quadrilateral is equal to 360°. Some quadrilateral are made up of a pair of parallel\r\n lines, while some are not. Examples of quadrilaterals are squares, rectangles, parallelograms, rhombuses, trapezoids, kites\r\n etc.