There will be two pairs. It is possible for all four angles to be identical.
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A parallelogram has 2 pairs of parallel lines and in the form of a rectangle it has 2 pairs of parallel lines and 4 perpendicular lines that meet at each of its corners at right angles.
there are 4 angles and normally, there would be 2 angles that are smaller than a right angle Except of cause if the parallelogram is a square or a rectangle, all angles are equal to 90 i.e. right angle
Many different quadrilaterals can have those angles. Depending upon the lengths of the sides, where the angles are and how many pairs of parallel sides it has, it could be: A cyclic quadrilateral, a trapezium, a parallelogram or a rhombus.
Two lines that intersect will create2 pairs of equal angles and if the lines are perpendicular the angles created will be right angles