Parallelogram vs Quadrilateral Quadrilaterals and parallelograms are polygons found in Euclidean Geometry. Parallelogram is a special case of the quadrilateral. Quadrilaterals can be either planar (2D) or 3 Dimensional while parallelograms are always planar. Quadrilateral Quadrilateral is a polygon with four sides. It has four vertices, and the sum of the internal angles is […]