After cutting a 2-meter-long cylindrical wood by 8 decimeters, the surface area is reduced by 100.48 square decimeters, find the original volume of the wood.
把一根长2米的圆柱形木材截下8分米后，表面积减少了100.48平方分米，求原来木材的体积．
<gadget id="calculator">100.48 / 8 / 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>