In parallelograms, diagonals always bisect each other
CCSS.MATH.CONTENT.HSG.CO.C.11Prove 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.
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https://schoolyourself.org/page/lti/sy/geometry/parallelogram-diagonals
