A circular fountain has a diameter of 6 meters, and a cement road with a width of 2 meters is built around the pool. Find the area of the road.
一个圆形喷水池的直径是6米，绕着这个水池修一条宽2米的水泥路．求路面的面积．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">25 - 9</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>