It is known that a cylinder of steel is 8 decimeters long. When it is cut into two cylinders, the surface area increases by 6.28 square centimeters compared to the original one. What is the volume of the original cylinder of steel?
已知一个圆柱体钢材，长8分米，将其切成两个圆柱体时，表面积比原来增加了6.28平方厘米，则原来圆柱体钢材的体积是多少．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 * 8 * 10</gadget>
<output>251.2</output>

<result>251.2</result>