CBSE 2026 · Region 4 · Set 1 · Q17 · 1 mark
Three points A($\displaystyle 0$, $\displaystyle 1$, $\displaystyle 1$), B($\displaystyle 2$, $\displaystyle 0$, -$\displaystyle 1$) and C($\displaystyle 1$, $\displaystyle 0$, $\displaystyle 3$) form $\displaystyle \Delta \mathrm{ABC}$. The $\displaystyle \operatorname{ar}(\triangle \mathrm{ABC})$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle \frac{\sqrt{53}}{2}$ sq. units
Three Dimensional GeometryDirection Cosines and Direction Ratios of a LineApplymcqmedium
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CBSE Class 12 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.