Four.
They are supplementary.
Rhombus
A parallelogram has two pairs of opposite sides which are parallel.
No
Four.
360
They are supplementary.
Yes it does - it has two pairs of equal angles.
Yes, and adjacent angles are supplementary (add to 180°)
Rhombus
rectangle
Not sure about a parallelgram, but a parallelogram has 4.
As many as you like.
2
4 sides
It depends. Most parallelograms don't have all right angles. However, there is a special type of parallelogram that has all right angles. You probably know this shape by its proper name, a rectangle.