The inner diameter of the faucet is 2 cm, and the speed of the water in it is 1 meter per second. When the faucet is turned on, how many liters of water will flow out in 1 minute.
自来水龙头内直径2厘米，里面水流速度是每秒1米，打开水龙头，1分钟流出水多少升．
<gadget id="calculator">2 / 100 / 2</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) ** 2</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">3.14 * (1/10_000) * 1 * 1 * 60 * 1_000</gadget>
<output>18.84</output>

<result>18.84</result>