A cylinder, if its bottom surface is divided into several sectors on average, then cut to form a rectangular parallelepiped with the same base, the surface area increases by 12 square decimeters, and if it is cut into two small cylinders, the surface area increases by 3.14 square meters In decimeters, find the surface area of the original cylinder.
一个圆柱体，如果将它的底面平均分成若干个扇形后，截开拼成一个和它等底的长方体，表面积增加了12平方分米，如果截成两个小圆柱体，表面积增加了3.14平方分米，求原来圆柱体的表面积．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">2 * 3.14 * 6</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 + 37.68</gadget>
<output>75.36</output>

<result>75.36</result>