10000 micrometers if it is one cenimeter per side
1. The surface area of a cone S is S=

, where r is the radius of the base and l is the slant height.
2. The slant height l is found as follows:



3.


4. The answer is C
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It would be B. 120 you would usually round up but the closest one to 129.02083 is 130 and since there is no 130 it would be 120