If a cylindrical steel material with a length of 2.5 meters and a diameter of 2 decimeters at the bottom is divided into 3 sections, how many square decimeters of surface area is increased?
把一根长2.5米，底面直径是2分米的圆柱形钢材平均分成3段，表面积增加了多少平方分米？
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1 * 4</gadget>
<output>12.56</output>

<result>12.56</result>