If you mean if one of the angles is a right angle, then yes, because a rectangle is the only option left if it is to remain a parallelogram.
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a rectangle has four right angles and opposite sides are all the same length This means that a parallelogram is not always a rectangle, but a rectangle is always a parallelogram, by definition.
A rectangle, possibly a square. Can you see why a parallelogram must be a rectangle if any one of its angles is right?
true.
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if a parallelogram is inscribed in a circle it is always a rectangle...............