A cylindrical piece of wood is 2 meters long. If it is cut into two pieces, the surface area will increase by 6.28 square meters. What is the surface area of this piece of wood in square meters?
一根圆柱形木料长2米，如果将它拦腰截成两段，表面积就增加6.28平方米．原来这根木料的表面积是多少平方米？
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">2 * 3.14 * 1 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 + 6.28</gadget>
<output>18.84</output>

<result>18.84</result>