After sawing a cylindrical piece of wood with a length of 10cm into 3 sections, the surface area increases by 3.14m**2. What is the volume of this piece of wood?
把一根长10cm的圆柱形木头锯成3段后，表面积增加了3.14m**2，这根木头的体积是多少．
<gadget id="calculator">3.14 / 4</gadget>
<output>0.785</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">0.785 * (1/10)</gadget>
<output>0.0785</output>

<result>0.0785</result>