If one angle is 90o (so that they are all 90o) then it will have at least 2.
In other words:
A square is a rectangle with equal sides
A rectangle is a parallelogram with equal angles.
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A parallelogram need have no lines of symmetry.
There are 0 lines of symmetry in a parallelogram.
a parallelogram has 2 lines of symmetry
A parallelogram.
A parallelogram.