Are all rectangles parallelograms?

The answer is yes. A parallelogram is defined as a quadrilateral (4-sided polygon) with both pairs of opposite sides parallel. A rectangle certainly fits that description. In addition, a rectangle must have 4 right angles. read more

Not all parallelograms are rectangles. A parallelogram is only a rectangle if it has four right angles and two pairs of parallel, congruent sides. Rectangles can also be called equiangular quadrilaterals, which means that they have four sides and equal angles. read more

Parallelograms: Quadrilaterals with opposite sides that are parallel. Rectangles: Parallelograms with right-angle corners. Squares: Rectangles with all sides of equal length. A square is a rectangle, but a given rectangle is not necessarily a square, etc. The squares are a subset of rectangles; the rectangles are a superset of squares. read more

No. All parallelograms are not rectangles. However, all rectangles are parallelograms. A parallelogram is a four sided figure with its opposite sides parallel to each other. A rectangle is a parallelogram whose four angles are all 90'. A square is a type of rectangle that has all four sides the same length. read more

Types of parallelograms that are not rectangles include rhombuses and rhomboids. A square, technically a type of rectangle, is also a parallelogram. All parallelograms have two sets of parallel and congruent sides and four edges or vertices. read more