If a 3-meter-long piece of wood is cut into 2 pieces on average, the surface area increases by 12.56 square decimeters. What is the volume of this cylinder of wood in cubic decimeters?
把一根3米长的木头平均截成2段，表面积增加12.56平方分米，这根圆柱体木头的体积是多少立方分米．
<gadget id="calculator">12.56 / 2</gadget>
<output>6.28</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">6.28 * 30</gadget>
<output>188.4</output>

<result>188.4</result>