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# GO Tweaks Menu Search Selection Guess this Toggle Console Proving a uadrilateral is a Parallelogram Assignment Active Determining Side Lengths in a Parallelogram In quadrilateral ABCD, AD 1, BC. 3x+7 D A B 5x-9 What must the length of segment AD be for the quadrilateral to be a parallelogram? O 8 units O 16 units O 31 units O 62 units

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