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· Triangle Law:

If two vectors are represented in magnitude and direction by two sides of a triangle taken in order, then their resultant (vector sum) is represented in magnitude and direction by the third side of the triangle.

· Parallelogram Law:

If two vectors are represented in magnitude and direction by two adjacent sides of a parallelogram taken in order, then their resultant (vector sum) is represented in magnitude and direction by the diagonal passing through the point of intersection of the adjacent sides.

· Some basic rules:

= - + = + m( + ) = m + m

· Linear combination of vectors

If and are two vectors and x and y are real numbers, then the vector x + y is called the linear combination of and .