Well, it first attempts to convince you that it is fair and square, but it becomes obvious that it has a least one side that is not on the level. In fact, a couple sides are not on the up-and-up, but slanted and untrue. Stay away from this impostor, he'll only take you down a slippery slope.
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Not so sure about an angel!
An angle of a parallelogram can have any value in the range (0, 180) degrees. The adjacent angle will be supplementary and the two pairs of opposite angles will be equal.
angle sum of a parallelogram
Yes a parallelogram with a right angle is a square.
A parallelogram with one right angle has four of them. The name for this figure is a rectangle.
parallelogram
are the opposite angle of parallelogram equal