HSG-CO.C.11
Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.
Tasks
Midpoints of the Sides of a Paralellogram
Is this a parallelogram?
Parallelograms and Translations
Congruence of parallelograms