There is a circular pool with a diameter of 16 meters in the park. If a circular path with a width of 5 meters is built beside the pool. What is the area of the path?
公园里有一个直径16米的圆形水池，如果在水池边修一条宽5米的环形小路．小路的面积是多少？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">13 ** 2</gadget>
<output>169</output>

<gadget id="calculator">3.14 * 169</gadget>
<output>530.66</output>

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

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

<gadget id="calculator">530.66 - 200.96</gadget>
<output>329.7</output>

<result>329.7</result>