If two vectors or a vector system is given to find the resultant it is not simple as finding the resultant of parallel vectors.
Triangular law
If given two vectors can be represented by the adjacent lines of a triangle, the magnitude of the resultant vector is given by the line which complete the triangle. And the direction is the opposite flow direction of the two vectors.
Polygonture's Law
If several vectors can be represented by the adjacent lines of a polygon. The magnitude of the resultant is given by the line which complete the polygon and the direction in the opposite flow direction of the other vectors.
a+b+c+d+e = f
Apply triangular law for each and every triangle.
If three vectors can be represented by a complete triangle the resultant would be 0
R=0
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