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.
Explanation: #if you need any queshtions answered within secs/mins hit me up and I gotchu.
Imma guess A! Idk if it’s 100% correct tho so I’d check that!
I sort of understand but what does it mean by.... Another?
It is by gaining! I just learned this in school. Hope this helps:)