Consecutive angles of a parallelogram are supplementary.
Opposite angles of a parallelogram are congruent.
A parallelogram with 4 right angles is a rectangle.
Such a parallelogram is a rectangle.
They can have any name that you want!
Always 360 degrees.
It has 4 sides and 4angles
Yes, opposite angles in a parallelogram must be equal.
A parallelogram which has all congruent sides and angles is a square.