Geometry · Quadrilaterals & Polygons
Rectangle
HSG-CO.C.11
Definition
A parallelogram with four right angles and congruent diagonals.
Examples
- A rectangle's diagonals are always equal in length.
- Every rectangle is a parallelogram, but not every parallelogram is a rectangle.
Key rule
A rectangle is a parallelogram with four 90 degree angles.
Memory hook
A parallelogram with all right angles.