The diameter of a circular flower bed is 10 meters, and a stone road with a width of 1.5 meters is paved around the flower bed. What is the area of this stone road?
一个圆形花坛的直径是10米，沿着花坛的四周铺一条宽1.5米的石路，这条石路的面积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1.5</gadget>
<output>6.5</output>

<gadget id="calculator">6.5 ** 2</gadget>
<output>42.25</output>

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

<gadget id="calculator">42.25 - 25</gadget>
<output>17.25</output>

<gadget id="calculator">3.14 * 17.25</gadget>
<output>54.165</output>

<result>54.165</result>