Well, there are actually 4 angles "of" a parallelogram. If you know one of them, you also have a second one and can calculate the others (since they all add up to 360º, and there are two pairs of equal angles). If not, use a protractor.
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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.
Right angle and acute