Problem 1 of 7
Use opposite sides of parallelogram ABCD to solve from AB=12.
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apply parallelogram side theorem.
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Figure must be a parallelogram; opposite side pairs are congruent.
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Solution
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1. Identify the opposite side pair.
2. Use parallelogram opposite sides are congruent.
3. Solve for the missing length or variable.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Setting adjacent sides equal unless the figure is also a rhombus.