If a 1-meter-long cylinder is sawn into three sections, the surface area increases by 8 square decimeters. What is the original volume of the cylinder?
把长1米地圆柱锯成三段，表面积增加了8平方分米，原来这个圆柱的体积是多少立方分米．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 1 * 10</gadget>
<output>20</output>

<result>20</result>