Exemplar - Determine the ratio — task. Maths CBSE Mentoring, Class 10 Foundation.

The radius of a hemispherical ball extends from \(5 cm\) to \(15 cm\) as air is being pumped into it. The ratios of the surface areas of the ball in the two cases is

\(9:1\)
\(3:1\)
\(1:9\)
\(1:3\)

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9. Exemplar - Determine the ratio

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