If a square log with a cross-sectional area of 40 square centimeters and a length of 3 meters is cut into three sections, the surface area is increased by how many square centimeters.
把一根横截面积是40平方厘米，长是3米的方木截成三段，表面积增加了多少平方厘米．
<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<result>160</result>