If a cube with an edge length of 4 decimeters is cut into the largest cylinder, what is the surface area of this cylinder?
把一个棱长为4分米的正方体木块削成一个最大的圆柱，这个圆柱的表面积是多少平方分米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

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

<gadget id="calculator">25.12 + 50.24</gadget>
<output>75.36</output>

<result>75.36</result>