A cube of wood, its base area is 9cm**2, cut it into 3 cuboids along the cross section, how much is the surface area increased?
一块正方体木料，它的底面积是9cm**2，把它沿截面截成3个长方体，表面积增加了多少？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>