Quadrilaterals 3rd Grade Worksheets | Free Online Worksheets Quadrilaterals 3rd grade worksheets will help students in learning about quadrilaterals, which are polygons having four sides, such as squares, rectangles, rhombuses, or parallelograms. These worksheets come with step-by-step solutions in the answer key to give students the necessary explanation. Benefits of 3rd Grade Quadrilaterals Worksheets