If a cylindrical steel material with a length of 1 meter and a diameter of 2 decimeters is cut into 2 sections, the surface area will be increased by how many square decimeters.
把一根长1米、底面直径是2分米的圆柱形钢材截成2段，表面积增加多少平方分米．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>