There is a cylindrical steel with a length of 2 meters. If it is cut into 5 identical cylinders, the surface area will increase by 3.2 square decimeters. What is the volume of this cylinder?
有一根长2米的圆柱形钢材，如果把它截成5段同样的圆柱，表面积比原来增加3.2平方分米，这根圆柱的体积是多少立方分米？
<gadget id="calculator">3.2 / 8</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 * 2 * 10</gadget>
<output>8</output>

<result>8</result>