On the list of choices that you posted along with your question,
there's no phrase that defines a parallelogram well at all.
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a parallelogram with four congruent angles
A rectangle is a quadrilateral with two pairs of parallel sides. That defines a parallelogram.
On the list of choices that you posted along with the question, there are no phrases that describe a square well at all.
The best classification for a parallelogram that has perpendicular diagonals is a rhombus. A rhombus has four sides that are congruent. The also diagonals bisect the vertex angles of this type of parallelogram.
my best answer is parallelogram if you dis agree please respond