Is every parallelogram a quadrilateral?

Every parallelogram is defined as having 4 sides where the opposite sides are parallel with one another. Since the definition of a quadrilateral is a figure with 4 sides, with no other requirements, every parallelogram falls within the title"quadrilateral". read more

A parallelogram is a quadrilateral with AB parallel CD and BC parallel to AD. That is, opposite sides are parallel A trapezoid is a quadrilateral that is not a parallelogram; one pair of opposite sides are not parallel. read more

Yes, all parallelograms are quadrilaterals. A quadrilateral is defined as any 4-sided polygon. Parallelograms are quadrilaterals in which opposite sides are parallel. So any 4-sided polygon such as squares, rectangles, trapezoids, rhombuses, etc., are all quadrilaterals. read more

That is, opposite sides are parallel A trapezoid is a quadrilateral that is not a parallelogram; one pair of opposite sides are not parallel. Every parallelogram has four sides and hence is a quadrilateral. You need to understand and learn definitions. quadrilateral - four sided figures. read more