There is a circular flower bed with a diameter of 8.4 meters in the campus. A path with a width of 1 meter is paved around it. What is the area of this path in square meters?
校园里有一个直径是8.4米的圆形花圃，在它的周围铺一条宽1米的小路，这条小路的面积是多少平方米？
<gadget id="calculator">8.4 / 2</gadget>
<output>4.2</output>

<gadget id="calculator">1 + 4.2</gadget>
<output>5.2</output>

<gadget id="calculator">5.2 ** 2</gadget>
<output>27.04</output>

<gadget id="calculator">3.14 * 27.04</gadget>
<output>84.9056</output>

<gadget id="calculator">4.2 ** 2</gadget>
<output>17.64</output>

<gadget id="calculator">3.14 * 17.64</gadget>
<output>55.3896</output>

<gadget id="calculator">84.9056 - 55.3896</gadget>
<output>29.516</output>

<result>29.516</result>