CBSE 2023 · Region 3 · Set 1 · Q5 · 1 mark
Let A be the area of a triangle having vertices $\displaystyle \left(\mathrm{x}_{1}, \mathrm{y}_{1}\right),\left(\mathrm{x}_{2}, \mathrm{y}_{2}\right)$ and $\displaystyle \left(\mathrm{x}_{3}, \mathrm{y}_{3}\right)$. Which of the following is correct?
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \left|\begin{array}{lll}\mathrm{x}_{1} & \mathrm{y}_{1} & 1 \\ \mathrm{x}_{2} & \mathrm{y}_{2} & 1 \\ \mathrm{x}_{3} & \mathrm{y}_{3} & 1\end{array}\right|= \pm 2 \mathrm{~A}$
DeterminantsArea of a TriangleRemembermcqeasy
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CBSE Class 12 Mathematics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.