A cylindrical piece of wood has a base circumference of 12.56 decimeters and a height of 4 meters. If it is cut into three small cylinders, how many square decimeters will the surface area increase?
一根圆柱形的木料底面周长是12.56分米，高是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">12.56 / 3.14 / 2</gadget>
<output>2</output>

<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>