A circular flower bed with a diameter of 6 meters is paved with a 2-meter-wide cement pavement around it. What is the area of this cement pavement in square meters?
一个直径是6米的圆形花坛，在它周围铺2米宽的水泥路面，这条水泥路面的面积是多少平方米？
<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>