Answer:
Opposite sides are congruent (AB = DC).
Opposite angels are congruent (D = B).
Consecutive angles are supplementary (A + D = 180°).
If one angle is right, then all angles are right.
The diagonals of a parallelogram bisect each other.
Each diagonal of a parallelogram separates it into two congruent triangles.
Number of sides = 4
Number of vertices = 4
Mutually Parallel sides = 2 (in pair)
Area = Base x Height
Perimeter = 2 (Sum of adjacent sides length)
Type of polygon = Quadrilateral
The opposite sides are parallel and congruent
The opposite angles are congruent
The consecutive angles are supplementary
Each diagonal bisects the parallelogram into two congruent triangles
Sum of square of all the sides of parallelogram is equal to the sum of square of its diagonals. It is also called parallelogram law
Please brianliest! Also, I gave you 2 extra facts :)