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Question Number 63900 by Rio Michael last updated on 10/Jul/19

Commented by Rio Michael last updated on 10/Jul/19

$$IntheDiagramaboveABCDandCDEFareparrallelograms$$$$whichlieinthesameplane.$$$$A\overrightarrow{B}=\mathit{p},B\overrightarrow{C}=\mathit{q}andC\overrightarrow{F}=\mathit{r}$$$$byconsideringareashowthat\mid \mathit{p}\times (\mathit{q}+\mathit{r})\mid =\mid \mathit{p}\times \mathit{q}\mid +\mid \mathit{p}\times \mathit{r}\mid$$

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