The radius of a circular vegetable field is 5 meters. It is necessary to build a path with a width of 2 meters around the vegetable field. What is the area of the path?
一块圆形菜地的半径是5米，要在菜地的周围修一条2米宽的小路，小路的面积是多少？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

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

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

<gadget id="calculator">49 - 25</gadget>
<output>24</output>

<gadget id="calculator">3.14 * 24</gadget>
<output>75.36</output>

<result>75.36</result>