A cylindrical wood with a length of 2 meters, after sawing off a section of 4 decimeters, the surface area is reduced by 50.24 square decimeters, what is the original volume of the wood?
一根长2米的圆柱形木料，锯掉4分米长的一段后，表面积减少了50.24平方分米，这根木料原来的体积是多少．
<gadget id="calculator">50.24 / 4 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 2 * 10</gadget>
<output>251.2</output>

<result>251.2</result>