A circular flower bed with a circumference of 25.12 meters is surrounded by a circular cement road with a width of 2 meters. What is the area of the cement road in square meters?
一个周长为25.12米的圆形花坛外面围一条2米宽的环形水泥道，则水泥道的面积是多少平方米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">113.04 - 50.24</gadget>
<output>62.8</output>

<result>62.8</result>