Geometry · Quadrilaterals & Polygons
Parallelogram
HSG-CO.C.11
Definition
A quadrilateral with both pairs of opposite sides parallel and congruent.
Examples
- In parallelogram ABCD, side AB is parallel and congruent to side DC.
- Opposite angles in a parallelogram are also congruent.
Key rule
A parallelogram always has two pairs of parallel, congruent opposite sides.
Memory hook
Opposite sides parallel and equal.