bucket with a circular bottom and a circumference of 12.56 decimeters, what is the area of its bottom in square meters?
一个底面是圆形的水桶，底面圆的周长是12.56分米，它的底面积是多少平方米？
<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">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">3.14 * (1/25)</gadget>
<output>0.1256</output>

<result>0.1256</result>