The school built a new circular fountain with a diameter of 8 meters, and now a circular lawn with a width of 2 meters is built along the outer edge of the fountain. What is the area of this circular lawn?
学校新建了一个直径8米的圆形喷水池，现沿着喷水池的外沿修建一条宽2米的环形草坪．这个环形草坪的面积是多少？
<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>