There used to be a circular flower garden with a diameter of 8 meters in Jiexin Park. During the National Day, the Garden Bureau placed peonies with a width of 2 meters on the periphery of the flower garden. Now how many meters do I have to walk around this flower garden?
街心公园原有一个直径8米的圆形花圃，国庆期间，园林局又在花圃外围摆了2米宽的牡丹花．现在绕这个花圃一圈，得走多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">3.14 * 12</gadget>
<output>37.68</output>

<result>37.68</result>