A 2m cement road is laid around a circular flower bed with a diameter of 7m. What is the area of this cement road in square meters?
在直径为7m的圆形花坛周围铺设一条2m的水泥路，这条水泥路的面积是多少平方米？
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) + 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">(11/2) ** 2</gadget>
<output>121/4 = around 30.25</output>

<gadget id="calculator">(7/2) ** 2</gadget>
<output>49/4 = around 12.25</output>

<gadget id="calculator">(121/4) - (49/4)</gadget>
<output>18</output>

<gadget id="calculator">3.14 * 18</gadget>
<output>56.52</output>

<result>56.52</result>