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Given: ABCD is a parallelogram with AB parallel to CD and AD parallel to BC. Diagonal AC is congruent to diagonal BD. Prove: ABCD is a rectangle (angles A, B, C, and D are right angles).
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At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?
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Given: ABCD is a parallelogram with AB parallel to CD and AD parallel to BC. Diagonal AC is congruen...
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