Divide a piece of cylindrical wood with a length of 20cm into two pieces of cylindrical wood, the surface area of which is increased by 62.8cm**2. What is the volume of the log in cm**3.
把一段长20cm的圆柱体木料，分成两段圆柱体木料，其表面积比原来增加了62.8cm**2．原木料的体积是多少cm**3．
<gadget id="calculator">62.8 / 2</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 * 20</gadget>
<output>628</output>

<result>628</result>