A cylinder of wood with a base radius of 2 decimeters and a height of 4 meters, if it is cut into three small cylinders, how many square decimeters will the surface area increase?
一根圆柱形木料底面半径2分米，高4米，如果把它截成三段小圆柱，表面积增加多少平方分米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>