There are several parallelogram depending on the context. One such is that the sum of the squares on the four sides of a parallelogram equals the sum of squares on its diagonals.
yes
No.
no
4
Yes.
yes
No, a parallelogram is not a trapezoid.
It is a special kind of parallelogram.
parrallelogram
180. Degrees
A rhombus
Yes it is a quadrilateral polygon.