After sawing a 2-meter-long cylindrical wood into three cylinders, the surface area increases by 8dm**2, what is the original volume of the wood in dm**3.
把2米长的圆柱形木料锯成三段圆柱体后，表面积增加了8dm**2，原来木料的体积是多少dm**3．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 10</gadget>
<output>40</output>

<result>40</result>