yes, when opposite angles and sides are congruent
a quadrilateral is a polygon with 4 sides
A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry
No.
yes/no
Yes.
yes
Yes.
yup:)
Yes it is
No, but it can be a parallelogram.
Yes.
yes