If a cylindrical piece of wood with a length of 2 meters is sawn into 3 sections, the surface area increases by 4 square decimeters, what is the volume of this piece of wood in cubic decimeters?
把一根长2米的圆柱形木料锯成3段，表面积增加4平方分米，这根木料的体积是多少立方分米．
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<result>20</result>