The diameter of a circular flower bed is 8 meters. Now lay a cement road with a width of 1 meter along the periphery of the flower bed. What is the area of the cement road in square meters?
一个圆形花坛的直径是8米，现在沿花坛的外围铺一条宽1米的水泥路，水泥路的面积是多少平方米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

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

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

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>