A 1-meter-long cylinder of steel, after cutting off a section of 2 decimeters, the surface area is reduced by 25.12 square decimeters, what is the original volume of this steel cylinder in cubic decimeters?
一根1米长的圆柱体钢材，截去2分米的一段后，表面积减少25.12平方分米，原来这根钢材的体积是多少立方分米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">25.12 / 2 / 6.28</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 1 * 10</gadget>
<output>125.6</output>

<result>125.6</result>