If a cylinder with a base radius of 2 cm is cut into 3 sections perpendicular to the height, how much is the surface area increased in square centimetres?
把一个底面半径为2cm的圆柱垂直于高切成3段，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>