path with a width of 2 meters is built outside a circular flowerbed with a diameter of 8 meters. How big is the path?
在一个直径是8米的圆形花圃外面修一条宽2米的小路，这条小路有多大？
<gadget id="calculator">8 / 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>