If a cuboid wood has a cross-sectional area of 4.5cm**2, if it is cut into 3 sections, how much will the surface area increase by cm**2?
一根长方体木料，它的横截面积是4.5cm**2，把它截成3段，表面积增加多少cm**2．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 4.5</gadget>
<output>18</output>

<result>18</result>