How to find the length of the side of a parallelogram - GRE Quantitative Reasoning

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Question

A parallelogram has a base of . The perimeter of the parallelogram is . Find the length of an adjacent side to the base.

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Answer

A parallelogram must have two sets of congruent/parallel opposite sides. Therefore, this parallelogram must have two sides with a measurement of and two base sides each with a length of Since the perimeter and one base length is provided in the question, work backwards using the perimeter formula:

, where and are the measurements of adjacent sides.

Thus, the solution is:

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