A 10-meter-long piece of wood with a parallel base is sawn into two sections of the same length, resulting in an increase in the surface area of 6.28 square meters. What is the original volume of the piece of wood?
把一根长10米的木料平行底面锯成一样长的两段，结果表面积增加了6.28平方米，这根木料原来的体积是多少．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>