4 they have 4 sides and 4 angles
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The questions doesn't make sense. An angle isn't a parallelogram. Parallelograms are types of shapes while an angle are to rays.
A right angle.
Normally, a parallelogram does not have a right angle.
A rectangle.
All the angles of a rectangle are right angle. This is not necessarily true of a parallelogram. There are many other differences that arise from this difference.