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1
if a parallelogram has at least 1 right angle, then its a rectangle
2
if a parallelogram has congruent diagonals, then its a rectangle
3
if a quad has 4 right angles, then its a rectangle
4
if a quad has 4 congruent angles, then its a rectangle
opp of 1
if a parallelogram is a rectangle, then it has at least 1 right angle
opp of 2
if a parallelogram is a rectangle, then it has congruent diagonals
opp of 3
if a quad is a rectangle, then it has 4 right angles
opp of 4
if a quad is a rectangle, then it has 4 congruent angles