The circumference of the base of a cylinder is 12.56 cm, and the height is 8 cm. If it is cut into two equal halves along the height, how many square centimeters will the surface area increase?
一个圆柱的底面周长是12.56厘米，高8厘米，沿高把它切成相等的两半，表面积增加了多少平方厘米．
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

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

<result>64</result>