The outer diameter of a bicycle tire is 70 cm. If the wheel rotates 100 times per minute on average, how many meters can it travel in half an hour?
一辆自行车轮胎的外直径是70厘米，如果车轮平均每分钟转100圈，半小时可以行多少米？
<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 70 * 1 * 30</gadget>
<output>6_594</output>

<result>6_594</result>