cuboid wood with a square cross section is cut into the largest cylinder. The surface area of the cylinder is 31.4cm**2, and the ratio of the diameter of the bottom to the height is 1:2. What is the surface area of the cuboid?
一个横截面是正方形的长方体木料，切割成最大的圆柱体，圆柱体的表面积是31.4cm**2，底面直径与高的比是1：2，长方体表面积是多少？
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

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

<gadget id="calculator">2 * 4 * 4</gadget>
<output>32</output>

<gadget id="calculator">8 + 32</gadget>
<output>40</output>

<result>40</result>