A satellite is flying around the earth, and its orbit is approximately circular. It is known that the satellite is 500 kilometers away from the surface of the earth, and it has flown 14 times. How many kilometers has the satellite traveled in total? (Earth's radius is about 6,400 meters long)
一颗卫星围绕地球飞行，飞行轨道近似为圆形，已知卫星距离地球表面500千米，飞行了14圈，问卫星一共飞行了多少千米．(地球的半径长约6,400米)
<gadget id="calculator">6_400 + 500</gadget>
<output>6_900</output>

<gadget id="calculator">3.14 * 6_900 * 2 * 14</gadget>
<output>606_648</output>

<result>606_648</result>