If a cylindrical piece of wood with a length of 2 meters is cut into three sections, the surface area increases by 8 square decimeters, what is the volume of this piece of wood in cubic decimeters?
把1根长2米的圆柱形木料截成三段，表面积增加了8平方分米，这根木料的体积是多少立方分米．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

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

<gadget id="calculator">2 * 20</gadget>
<output>40</output>

<result>40</result>