Geometry · Quadrilaterals & Polygons
Trapezoid
HSG-CO.C.11
Definition
A quadrilateral with exactly one pair of parallel sides.
Examples
- The two parallel sides of a trapezoid are called its bases.
- A trapezoid's non-parallel sides are called its legs.
Key rule
A trapezoid has exactly one pair of parallel sides, not two.
Memory hook
Only one pair of sides runs parallel.