It takes about 89 days to complete a sailing trip around the earth if it sails 450 kilometers a day. About how many kilometers does it take to go around the earth once?
绕地球一周航海旅行，如果每天航行450千米，大约需要89天才能完成．绕地球一周大约要行多少千米？
<gadget id="calculator">450 * 89</gadget>
<output>40_050</output>

<result>40_050</result>