There is a circular flower bed with a diameter of 8 meters. There is a path around the flower bed with a width of 3 meters. What is the area of this path in square meters?
一个圆形花坛，直径为8米，绕花坛有一条小路，宽3米，这条小路的面积是多少平方米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

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

<gadget id="calculator">49 - 16</gadget>
<output>33</output>

<gadget id="calculator">3.14 * 33</gadget>
<output>103.62</output>

<result>103.62</result>