After cutting a cylindrical steel with a length of 1m into 3 sections, the surface area increases by 6.28dm**2. What is the original volume of the steel in dm**3?
把一根长1m的圆柱体钢材截成3段后，表面积增加了6.28dm**2，这根钢材原来的体积是多少dm**3．
<gadget id="calculator">6.28 / 4</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 * 1 * 10</gadget>
<output>15.7</output>

<result>15.7</result>