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Mathematics · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 2 · Q4
A cone of height 28 cm and radius of base 7 cm is made up of modelling clay. A child reshapes it in the form of a sphere. Find the radius of the…
A cone of height $\displaystyle 28$ cm and radius of base $\displaystyle 7$ cm is made up of modelling clay. A child reshapes it in the form of a sphere. Find the radius of the sphere.
Marking-scheme solution
$\displaystyle \begin{array}{l}\frac{1}{3} \pi \times 7 \times 7 \times 28=\frac{4}{3} \pi r^{3}
\quad \Rightarrow r=7 \mathrm{~cm}\end{array}$
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CBSE Class 10 Mathematics past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.