no
No.
4
No, a parallelogram is not a trapezoid.
none
The remaining shape could be a [concave] hexagon although in some circumstances it could be a smaller parallelogram.
no
No.
yes
Yes.
yes
4
No, a parallelogram is not a trapezoid.
180. Degrees
parrallelogram
It is a special kind of parallelogram.
Yes it is a quadrilateral polygon.