A cuboid of wood has a base area of 10 square centimeters, if it is cut into three sections, how much square centimeters will the surface area increase?
一根长方体木料，它的底面积是10平方厘米，把它截成三段，表面积增加多少平方厘米．
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>