Definition I was taught: "A rectangle is a parallelogram with one right angle"
Sounds weird but when you think it out, having one right angle in a parallelogram means the other three must be right as well.
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A rectangle.
A square.
parallelogram
Well, honey, that's not a parallelogram, that's a rectangle. A parallelogram can have opposite sides equal in length and opposite angles equal in measure, but not necessarily right angles. So, in this case, you're describing a rectangle, not a parallelogram. But hey, at least you're on the right track!
sometime actually -A rectangle is a parallelogram with 4 right angles. -A square is a parallelogram with 4 right angles and 4 congruent sides. Congruent sides are the same length.