Proving the paralellogram side teorema

DEFINITION: A parallelogram is a quadrilateral with both pairs of opposite sides parallel. THEOREM: If a quadrilateral has 2 sets of opposite sides congruent, then it is a parallelogram. THEOREM: If a quadrilateral has 2 sets of opposite angles congruent, then it is a parallelogram.

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the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

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