Hongguang Primary School has a circular flower bed with a circumference of 31.4 meters. Now lay a 0.6-meter-wide gravel road along the flower bed. What is the area of the gravel road in square meters?
红光小学有一圆形花坛，周长是31.4米．现在沿花坛周围铺一条0.6米宽的石子路，石子路的面积是多少平方米？
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 0.6</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 ** 2</gadget>
<output>31.36</output>

<gadget id="calculator">3.14 * 31.36</gadget>
<output>98.4704</output>

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

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">98.4704 - 78.5</gadget>
<output>19.9704</output>

<result>19.9704</result>