If a cylindrical steel material with a length of 1 meter and a diameter of 2 decimeters at the bottom is cut into 3 small cylinders, what is the increase in the surface area by how many square decimeters?
把一根长1米，底面直径2分米的圆柱形钢材截成3个小圆柱，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>