Two pairs
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A parellelogram has equal sides, the trapezoid is a parallelogram.
The opposite sides are equal, so 2 pairs of equal sides, or in special circumstances where they are all equal, the answer is 4 (4 equal sides makes it a rhombus, which is a special parallelogram)
The rhombus (all four sides equal length) and rectangle (all four angles 90°) are both special cases of parallelogram. (2 pairs of parallel sides). There are many cases of parallelogram which are not either rhombus or rectangle. If a parallelogram has one pair of sides = 3, and the other pair of sides = 5, and none of the angles are 90°, then it is neither rhombus or rectangle.
An isosceles triangle has 2 sides of equal length. The other two types are scalene (with no sides of equal length) and equilateral (with all sides equal in length)
All three sides of an equilateral triangle are..."equal" in length.