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In parallelogram PQRS, Q is a right angle. Is PQRS a rectangle?
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In parallelogram PQRS, Q is a right angle. Is PQRS a rectangle?

User Mororo
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Yes, this is because opposite angles of a parallelogram are congruent. The adjacent angles are supplementary. Since one angle is 90, the other angle must be 90. So this points to the fact that all angles must be 90 degrees.
User Mohsen Bahman
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