CBSE - XII Science - Mathematics
This is Triangle law of vectors
If two vectors are represented by two sides of a triangle in sequence, then third closing side of the triangle, in the opposite direction of the sequence, represents the sum (or resultant) of the two vectors in both magnitude and direction.
Adding vector CA on either sides of the equation,
The right hand side of the equation is vector sum of two equal and opposite vectors, which evaluates to zero
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