A cylinder with a base radius of 2 decimeters and a length of 4 meters is cut into 3 sections. What is the total increase in the surface area of the cylinder?
一个圆柱的底面半径是2分米，长4米，横截成3段，表面积一共增加多少平方分米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>