A cylinder, the circumference of the base is 12.56 cm, and the height is 8 cm. After cutting it into two parts vertically along the diameter of the base, what is the total area of the cut surface in square centimeters?
一个圆柱，底面周长是12.56厘米，高是8厘米，沿底面直径垂直把它切成两部分后，切割面的面积一共是多少平方厘米？
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">8 * 4 * 2</gadget>
<output>64</output>

<result>64</result>