There is a circular flower bed with a diameter of 25 meters. A 1-meter cobblestone path is to be paved around it. What is the area of this path in square meters?
有一个圆形花坛，直径是25米，要在它的周围铺一条1米的鹅卵石小路，这条小路的面积是多少平方米？
<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) + 1</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">(27/2) ** 2</gadget>
<output>729/4 = around 182.25</output>

<gadget id="calculator">(25/2) ** 2</gadget>
<output>625/4 = around 156.25</output>

<gadget id="calculator">(729/4) - (625/4)</gadget>
<output>26</output>

<gadget id="calculator">3.14 * 26</gadget>
<output>81.64</output>

<result>81.64</result>