A circular carousel site is to be built in the children's playground. The diameter of the carousel's rotating range is 8 meters, and a 1-meter-wide path should be reserved around it, and railings should be fenced on the outside. What is the area of the site?
儿童乐园要修建一个圆形旋转木马场地，木马旋转范围的直径是8米，周边还要留出1米宽的小路，并在外侧围上栏杆，这块场地的占地面积是多少？
<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>

<result>78.5</result>