A 2-meter-high cylindrical wood is sawn into two small cylindrical wood pieces, and the surface area increases by 8 square decimeters. What is the volume of the original wood in cubic decimeters?
把2米高的圆柱木料锯成两段小圆柱形木料，表面积增加了8平方分米．原来木料的体积是多少立方分米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<result>80</result>