If a cylindrical steel material with a length of 1 meter and a diameter of 2 decimeters at the bottom is cut into 2 small cylinders, the surface area is increased 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2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 * 2</gadget>
<output>6.28</output>

<result>6.28</result>