They are in the class of 4 sided quadrilaterals
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yes, but there are other shapes too.
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
Parallelagram, Rhombus, Square, or Rectangle are the ones with congruent sides. There are also shapes like Trapezoids that do not have equal sides.
yup:)
No, but it can be a parallelogram.