A cylindrical log with a length of 5 meters is sawn into 3 sections along the cross section, and the surface area increases by 12.56 square meters. What is the volume of this log in cubic meters?
一根长5米的圆柱形木料，沿横截面把它锯成3段，表面积增加了12.56平方米，这根木料的体积是多少立方米．
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>