If the radius of a spherical balloon shrinks from \( 10 \mathrm{~cm} \) to \( 9.8 \mathrm{~cm} \...

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If the radius of a spherical balloon shrinks from \( 10 \mathrm{~cm} \) to \( 9.8 \mathrm{~cm} \), find the approximate decrease in its surface area.
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