Cut a cylinder into two half cylinders, the cut surface is a square, the volume of each half cylinder is 25.12 cubic centimeters, find the surface area of each half cylinder in square centimeters.
把一个圆柱切成两个半圆柱，切面是个正方形，已知每个半圆柱的体积是25.12立方厘米，求每个半圆柱的表面积是多少平方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

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

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

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

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">12.56 + 25.12 + 16</gadget>
<output>53.68</output>

<result>53.68</result>