Roll a piece of rectangular paper with a length of 12.56 cm and a width of 10 cm into a cylinder. What is the area of the base of the cylinder?
用一张长12.56厘米，宽10厘米的长方形纸卷成一个圆柱，这个圆柱的底面积是.多少平方厘米
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

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

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

<result>12.56</result>