Cone with radius and slant height given: curved surface area

1. A.
   $3880\ \text{cm}^2$
2. B.
   $3820\ \text{cm}^2$
3. C.
   $3960\ \text{cm}^2$
4. D.
   $4020\ \text{cm}^2$

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1. A.
   $1490\ \text{cm}^2$
2. B.
   $1265\ \text{cm}^2$
3. C.
   $1386\ \text{cm}^2$
4. D.
   $1262\ \text{cm}^2$

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