9-58. Decide if the following statements are true or false. If they are true, explain how you know. If they are false, provide a counterexample.
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a. If a quadrilateral has two sides that are parallel and two sides that are congruent, then the quadrilateral must be a parallelogram.
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HINT: Drag the GREEN point to see how many different quadrilaterals you can make with two parallel sides and two congruent sides.
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