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.
Yes every square is 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.
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.
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.