Cut a 2-meter-long cylindrical steel into two sections, and the surface area increases by 6.28 square meters. What is the original volume of this steel in cubic meters?
把一根长2米的圆柱形钢材截成2段，表面积增加了6.28平方米，这根钢材原来的体积是多少立方米．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>