circular flower bed with a diameter of 15 meters is surrounded by a circular path with a width of 20 decimeters. How many square meters does this path occupy?
一个直径是15米的圆形花坛，周围是一条20分米宽的环形小路，这条小路的占地面积是多少平方米？
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) + 2</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">(19/2) ** 2</gadget>
<output>361/4 = around 90.25</output>

<gadget id="calculator">3.14 * (361/4)</gadget>
<output>283.385</output>

<gadget id="calculator">(15/2) ** 2</gadget>
<output>225/4 = around 56.25</output>

<gadget id="calculator">3.14 * (225/4)</gadget>
<output>176.625</output>

<gadget id="calculator">283.385 - 176.625</gadget>
<output>106.76</output>

<result>106.76</result>