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Question Number 129591 by mohammad17 last updated on 16/Jan/21

Answered by mr W last updated on 16/Jan/21

$$AC=(2,4)$$$$BD=(4,-2)$$$$\cos \theta =\frac{AC\cdot BD}{\mid AC\mid \times \mid BD\mid }=\frac{2\times 4-4\times 2}{2^2+4^2}=\frac{0}{20}=0$$$$\Rightarrow \theta =90°$$

Commented by mohammad17 last updated on 16/Jan/21

$$sirwhatisthevalueof\mid AC\mid \times \mid BD\mid$$

Commented by mr W last updated on 16/Jan/21

$$ithoughtyoucanget\mid AC\mid \times \mid BD\mid$$$$byyourself.$$

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