If a cylinder with a base radius of 2 cm is cut into three cylinders of the same size, how much does the surface area increase in square centimetres?
把一个底面半径是2厘米的圆柱，切成三个同样大的圆柱，表面积增加了多少平方厘米．
<gadget id="calculator">3.14 * 2 * 2 * 4</gadget>
<output>50.24</output>

<result>50.24</result>