Exemplar - Determine the ratio — task. Maths CBSE Live product, Class 9 (2025-26).

The radius of a hemispherical ball rises from \(10 cm\) to \(15 cm\) as air is being pumped into it. The ratios of the surface areas of the ball in the two cases is

\(4:9\)
\(2:3\)
\(1:9\)
\(3:2\)

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1. Exemplar - Determine the ratio

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