The diameter of a circular pool is 10 meters, and a path with a width of 1 meter is built around the pool. What is the area of the path?
一个圆形水池的直径是10米，在水池的周围修一条1米宽的小路，这条小路的面积是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

<gadget id="calculator">36 - 25</gadget>
<output>11</output>

<gadget id="calculator">3.14 * 11</gadget>
<output>34.54</output>

<result>34.54</result>