Yes every parallelogram is a 4 sided polygon
Yes.
No, but it can be a parallelogram.
yes
Yes
Dragon is the answer
Some of them are, but not all of them. A parallelogramis a rectangle only if all of its angles are equal.
No not every quadrilateral can be a regular polygon.
Parallelagram, Rhombus, Square, or Rectangle are the ones with congruent sides. There are also shapes like Trapezoids that do not have equal sides.
Yes every square is a regular polygon.
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.
If every side of the polygon is the same length, then it is a regular polygon. If the measure of every internal angle of a polygon is the same as every other, then it is a regular polygon. The two always go together, so you need to check only one of the above criteria.