It is known that the radius of the earth (regarded as a circle) is 6375 kilometers. If a person with a height of 1.8 meters walks around the earth, how many meters does the head walk more than the feet. (The result keeps π)
已知地球(看成圆形)的半径是6375千米，一个身高为1.8米的人绕着地球走一圈，头比脚多走多少米．(结果保留π)
<gadget id="calculator">3.14 * 2 * 1.8</gadget>
<output>11.304</output>

<result>11.304</result>