Children, do you like to eat ham? A cylindrical piece of ham is 20 cm long and has a base radius of 2 cm. If it is cut into 3 sections along the cross section, by how many square centimeters does the surface area increase?
小朋友，你喜欢吃火腿吗？一段圆柱形火腿长20cm，底面半径是2cm．如果把它沿横截面切成3段，表面积增加了多少平方厘米？
<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>