section of 2 decimeters long is cut off from a 1 meter long cylinder, and its surface area is reduced by 12.56 square decimeters. What is the volume of this piece of wood in cubic decimeters?
从一根1米长的圆柱形木料上锯下2分米长的一段，其表面积减少了12.56平方分米．原来这根木料的体积是多少立方分米．
<gadget id="calculator">12.56 / 2 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>