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The distance of the point from the plane will be:
The distance of the point $2\hat{i} + \hat{j} - \hat{k}$ from the plane $\vec{r} \cdot (\hat{i} - 2\hat{j} + 4\hat{k}) = 9$ will be:
- (a)$13$
- (b)$\frac{13}{\sqrt{21}}$
- (c)$21$
- (d)$\frac{21}{\sqrt{13}}$
Answer
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From ISC 2023 Mathematics Paper 1, question 15(ii).