Problem 114 of 7
Use the converse condition for parallelogram from opposite angles: angle alpha equals angle gamma and angle beta equals angle delta in quadrilateral ABCD.
Using a hint is okay. It just tells the trainer to give you a little more review.
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identify angle sufficient condition.
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Both pairs of opposite angles must be congruent.
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Your answer is equivalent to the expected form.
Walkthrough
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1. Identify the two opposite angle pairs.
2. Verify both pairs are congruent.
3. Apply the converse theorem to classify the quadrilateral.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using only one opposite angle pair.