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Can the quadrilateral be a parallelogram if two opposite angles are right angles, but the quadrilateral is not a rectangle?
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Can the quadrilateral be a parallelogram if two opposite angles are right angles, but the quadrilateral is not a rectangle?

User Dlackty
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Geometry.
If two opposite angles are right angles, then the other angles have to be right angles. So yes, it is a parallelogram.
User Vitalyster
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5 votes
If the two opposite angles are 90 degrees(right angles) the other two angles must also be right angles.
If it's not a rectangle it has to be a square.
User Stagleton
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