Addition of vectors
Parallelogram law of vector addition
According to the parallelogram law of vector addition:
“If two vector quantities are represented by two adjacent sides or a parallelogram then the diagonal of parallelogram will be equal to the resultant of these two vectors.”
Explanation
Consider two vectors 
Let the vectors have the following orientation
parallelogram of these vectors is :
According to parallelogram law:
Magnitude Of resultant Vector
Magnitude of resultant vector can be determined by using either sine law or cosine law.
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