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Applied Mathematics · 2026 · 1 mark
CBSE 2026 · Central · Set 4 · Q8
The rate of change of the area of a circle with respect to its radius r (in cm^2 / s ), when r =6 cm, is:
The rate of change of the area of a circle with respect to its radius r (in $\displaystyle \mathrm{cm}^2 / \mathrm{s}$), when $\displaystyle \mathrm{r}=6 \mathrm{~cm}$, is :
Official answer
(B)
$\displaystyle 12 \pi$
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CBSE Class 12 Applied Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.