Question

When we will apply parallelogram and when we will apply triangle law?

Answer 1

◆ 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.

◆ Triangle Law of Vectors states that if two vectors are represented as adjacent sides of a triangle then the third side taken in opposite order is the resultant of the two. This law is used to find the resultant of two vector which gives both magnitude and direction.

Answer 2

to add two vectors we use triangle law

that is if two sides represent two vectors in one direction third side represent the sum in opposite direction

to add and to subtract we use parallelogram law

that is if sides represent two vector.

one diagonal represent sum

another diagonal represent the difference of vectors