If the base area of a cylindrical piece of wood is 2 square decimeters, if it is cut into 4 sections, how much square decimeters will the surface area increase?
一根圆柱形木材的底面积是2平方分米，把它锯成4段，表面积增加多少平方分米．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<result>12</result>