Hope Primary School builds a circular flower bed with a diameter of 8 meters, and paves a circular path with a width of 1 meter around the flower bed. What is the area of this path?
希望小学修建一个直径8米的圆形花坛，在花坛周围铺一条宽1米的环形小路．这条小路的面积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

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

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">78.5 - 50.24</gadget>
<output>28.26</output>

<result>28.26</result>