Cut a cylindrical piece of wood with a length of 2m into two sections, the surface area of which is increased by 0.785m**2 compared with the original piece of wood, what is the volume of this cylindrical piece of wood?
把一根长2m的圆柱形木料截成2段，表面积比原木料增加了0.785m**2，这根圆柱形木料的体积是多少．
<gadget id="calculator">0.785 / 2</gadget>
<output>0.3925</output>

<gadget id="calculator">0.3925 * 2</gadget>
<output>0.785</output>

<result>0.785</result>