How are parallelograms different from rectangles? - Answers

All parallelograms do not have 90 degree angles. Those that do are called rectangles, a special subgroup within the term.All that is required of a parallelogram is that opposite sides are parallel. Another special case of parallograms is the rhombus, a parallelogram with 4 equal sides but no right angles.A parallelogram is a 4-sided polygon where the opposite sides are parallel. A rectangle is a type of parallelogram, but it has the added requirement that all angles are right angles (90°).Sometimes the term parallelogram is used to indicate that a regular quadrilateral is not a rectangle, but has two pairs of identical angles.Rectangle is "a parallelogram with one right angle", (which means all angles are right)