Build a circular path around a circular flowerbed. The radius of the flowerbed is 5 meters and the width of the path is 2 meters. What is the area of the circular path in square meters?
在一个圆形花圃周围修一条环形小路，花圃半径为5米，小路宽2米，环形小路的面积是多少平方米．
<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>