How is it that we use the concept "sum of two sides of a triangle formed by vectors is equal to the third side" in some cases while in others we use "sum of all sides of a vector triangle is zero"?
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Case1: In this case if a and b are two vectors and tail of vector a is connected with tail of vector b then sum is given by vector a+b .
case2:If a triangle is formed by the vectors a,b and c in such a way that nose of vector a is connected to tail of vector b,nose of b is connected to tail of vector c and nose of vector c is connected to the tail of vector a then vector a+b+c =0.
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