2-meter cylindrical wood, after sawing it into four equal sections, the surface area increases by 120 square centimeters, what is the original volume of this wood?
一根2米的圆柱体木料，把它锯成相等的四段后，表面积增加120平方厘米，原来这根木料的体积是多少．
<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">20 * 200</gadget>
<output>4_000</output>

<result>4_000</result>