2-meter-long cylinder of wood is sawn into 3 small cylinders, and their total surface area increases by 12.56 square decimeters. What is the original volume of this wood in cubic decimeters?
一根2米长的圆柱体木材，锯成3段小圆柱后，它们的表面积总和比原来增加了12.56平方分米，原来这根木材的体积是多少立方分米．
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 * 2 * 10</gadget>
<output>62.8</output>

<result>62.8</result>