A pair of each. Unless it is a rectangle, in which case it has none.
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It has two obtuse angles
A parallelogram has 0 or 2 acute angles. If the parallelogram happens to have four right-angled corners, it is still a parallelogram (and a rectangle), but no acute angles.
It can have 0 or 2 right angles, 1 or 2 acute or obtuse angles.
Two.
Except for the special case of a rectangle, a parallelogram must have two obtuse angles.