If a cylinder with a base area of 3.14 square centimeters is cut into two cylinders of the same size, how many square centimeters does the surface area increase?
把一个底面积是3.14平方厘米的圆柱，切成两个同样大小的圆柱，表面积增加了多少平方厘米．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>