The circumference of a circular pool is 31.4 meters. A cement road with a width of 1 meter is built around it. What is the area of the cement road in square meters?
一个圆形水池周长是31.4米，在它周围修一条1米宽的水泥路，水泥路面积是多少平方米．
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">36 - 25</gadget>
<output>11</output>

<gadget id="calculator">3.14 * 11</gadget>
<output>34.54</output>

<result>34.54</result>