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There are no right angles in a parallelogram. A parallelogram only has right angles if it is a rectangle, in which case it has exactly four.
Parallelogram have 4 right angles. (because, square and rectangle is also parallelogram)
none
a rhombus is a parallelogram with no right angles.
It is not a requirement that any of the angles are right angles (90 degrees), to qualify as a parallelogram.