parallelogram law of vector addition
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The simplest form of the parallelogram law belongs to elementary geometry. It states that the sum of the squares of the lengths of the four sides of a parallelogram equals the sum of the squares of the lengths of the two diagonals.
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R= a b + 2abcos
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it states that actors acting on a particle at the same time be represented in magnitude and direction by the two adjacent sides of a parallelogram drawn from a point
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