The diameter of the wheel of a bicycle is 0.5 meters. If the wheel of this bicycle rotates 200 times per minute, it will pass a bridge in 4 minutes. How long is the bridge?
一辆自行车的车轮直径是0.5米，如果这辆自行车的车轮每分钟转200圈，它4分钟通过一座大桥，这座大桥长多少米．
<gadget id="calculator">3.14 * 0.5 * 200 * 4</gadget>
<output>1_256</output>

<result>1_256</result>