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

The radius of a hemispherical balloon expands from \(7 cm\) to \(14 cm\) as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is

\(2:1\)
\(4:1\)
\(1:4\)
\(1:2\)

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9. Exemplar - Determine the ratio

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