The diameter of a circular fountain is 8m. Now it is necessary to pave a 2-meter-wide tile path around the pool outside the pool. What is the tiled area?
一个圆形喷水池的直径是8m，现要在水池的外围绕水池一周铺一条2米宽的瓷砖小路，铺瓷砖的面积是多少？
<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">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>