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Mathematics · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q25
Two concentric circles are of radii $\displaystyle 5$ cm and $\displaystyle 4$ cm. Find the length of the chord of the larger circle which touches the smaller circle.
Marking-scheme solution
\(\displaystyle \mathrm{OM} \perp \mathrm{AB}\)
\(\displaystyle \mathrm{AM}=\sqrt{5^{2}-4^{2}}=3 \mathrm{~cm}\)
\(\displaystyle \mathrm{AB}=2 \times 3=6 \mathrm{~cm}\)More from Circles
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CBSE Class 10 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.