The diameter of a circular flower bed is 6 meters. Now lay a cement pavement with a width of 1 meter along the outer periphery of the flower bed. What is the area of the cement pavement in square meters?
一个圆形花坛的直径是6米，现在沿花坛的外周铺一条宽1米的水泥路面，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 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

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

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">3.14 * 7</gadget>
<output>21.98</output>

<result>21.98</result>