There is a circular flower bed with a diameter of 16m in the garden. A 2m-wide gravel road is laid around it. Find the area of the gravel road. If it costs 45 yuan per square meter, how much is the total cost of paving the road? ?
花园里有一个直径为16m的圆形花坛，沿着它的周围铺设2m宽的石子路，求这条石子路的面积，如果每平方米需要45元钱，铺这条路一共需要多少元钱？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<gadget id="calculator">314 - 200.96</gadget>
<output>113.04</output>

<gadget id="calculator">113.04 * 45</gadget>
<output>5_086.8</output>

<result>5_086.8</result>