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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