1. Define the properties of a parallelogram and prove them.
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opposition sides are parallel
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1. Define the properties of aLesson Summary
You have learned that a parallelogram is a closed, plane figure with four sides. It is a quadrilateral with two pairs of parallel, congruent sides. Its four interior angles add to 360° and any two adjacent angles are supplementary, meaning they add to 180° . Opposite (non-adjacent) angles are congruent. parallelogram and prove them.
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