If a cylinder is dug out of a cuboid block whose length, width, and height are 4 cm, 4 cm, and 5 cm, what is the maximum surface area of the cylinder? (π takes 3)
在一个长、宽、高分别为4厘米、4厘米、5厘米的长方体木块中挖一个圆柱体，则这个圆柱体的表面积最大为多少．(π取3)
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 4 * 2</gadget>
<output>24</output>

<gadget id="calculator">3 * 4 * 5</gadget>
<output>60</output>

<gadget id="calculator">24 + 60</gadget>
<output>84</output>

<result>84</result>