The length of a cylindrical piece of wood is 1.8 meters. If it is sawed into 3 sections, the surface area increases by 16 square meters. What is the volume of this piece of wood?
圆柱形木料长1.8米，把它锯成3段，表面积增加了16平方米，原来这根木料的体积是多少．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 1.8</gadget>
<output>7.2</output>

<result>7.2</result>