There is a circular path with a width of 2 meters around the circular pool, and the diameter of the pool is 8 meters. How many square meters does this path occupy?
圆形水池的周围有一条环形小路宽2米，水池的直径是8米．这条小路占地多少平方米？
<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">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>