On the list of choices that you posted along with the question,
there are no phrases that describe a square well at all.
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On the list of choices that you posted along with your question, there's no phrase that defines a parallelogram well at all.
a parallelogram with four congruent angles
Yes.
No. Convention defines perfect squares as squares of positive integers.
152 = 225, and 162 = 256 So there can be no integer, k, such that k2 = 250 and that is what defines a perfect square.