After sawing a 2-meter-long cylindrical wood into three small cylinders, the sum of their surface areas increases by 12.56 square decimeters compared to the original one. What is the original volume of the wood?
把一根2米长的圆柱形木材，锯成3段小圆柱后，它们的表面积之和比原来增加了12.56平方分米，原来木材的体积是多少？
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>