If the radius and slant height of a cone are in the ratio \( 4: 7 \) and its curved surface area...

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If the radius and slant height of a cone are in the ratio \( 4: 7 \) and its curved surface area is \( 792 \mathrm{~cm}^{2} \), then its radius is (take \( \pi \) as 22/7)
a. \( 18 \mathrm{~cm} \)
b. \( 8 \mathrm{~cm} \)
-c. \( 12 \mathrm{~cm} \)
d. \( 9 \mathrm{~cm} \)
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