There are six important properties of parallelograms to know:
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.
For base, count how many units is the parallelogram is in width, then for height, do it for how many units the parallelogram is in heigth. Then mulitply those togther to get the area.
A = 4 6 24
B = 7 3 21
C = 6 3 18
D = 2 6 12
