A cuboid wood with a length of 100cm has a cross-sectional area of 20cm**2, how much does the surface area increase in cm**2 after cutting it into 3 sections?
一根长为100cm的长方体木料，它的横截面的面积是20cm**2，把它截成3段后表面积增加了多少cm**2．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 20</gadget>
<output>80</output>

<result>80</result>