The inner diameter of the tap water faucet is 2cm, and the water flow speed inside is 1m per second. When the tap is opened, how many tons of water will flow out in one hour.
自来水笼头内直径2cm，里面水流速度是每秒1m，打开笼头，1小时流出水大约是多少吨．
<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">1 * 3.14 * (1/10_000) * 1 * 1 * 3_600</gadget>
<output>1.1304</output>

<result>1.1304</result>