SOLUTION: a parallelogram with one right angle must be a?

Question 537191: a parallelogram with one right angle must be a?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
The opposite angle in a parallelogram is congruent, so in this case it is also a right angle.
The adjacent angles in a parallelogram are supplementary, so in this case they must also be right angles.
So, with four right angles, this parallelogram is a rectangle. That includes the kind of rectangle that has all four sides congruent (equal lengths), and is called square.
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