If a steel cylinder with a length of 4 meters is cut into three small cylinders, its surface area will increase by 50.24 square decimeters. What is the volume of this steel cylinder?
如果把一个长4米圆柱体钢材横截成3段小圆柱，它的表面积会增加50.24平方分米，这根圆柱体钢材的体积是多少．
<gadget id="calculator">12.56 * 40</gadget>
<output>502.4</output>

<gadget id="calculator">502.4 / 10</gadget>
<output>50.24</output>

<result>50.24</result>