Question:
how do we come to know that the resultant is a b or a-b in triangle method because in both head and tail are touching
Answer:
To find the sum A+B, place the tail of B at the head of A. Then the sum C=A+B is defined as the vector from tail of A to the head of B.
In vectors, if there are two vectors V and -V, then it shows that the magnitude of both these vectors are same but direction is opposite.When we put a minus sigh it show the vector with opposite direction.
So, to find the difference D=A-B, simply add (-B) to A.
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