Vectors along the adjacent sides of parallelogram are and

MATHEMATICS · Subjective · A Level · Mathematics · Vectors · Vectors

Problem

Vectors along the adjacent sides of parallelogram are a=i^+2j^+k^\mathbf{a} = \hat{i} + 2\hat{j} + \hat{k} and b=2i^+4j^+k^\mathbf{b} = 2\hat{i} + 4\hat{j} + \hat{k} . Find the length of the longer diagonal of the parallelogram.

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