A cylindrical steel material with a length of 3 meters and a diameter of 2 decimeters at the bottom is sawed into two small cylinders, how much is the surface area increased?
把一根长3米，底面直径是2分米的圆柱形钢材锯成2个小圆柱，表面积增加多少．
<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>