The inner diameter of the water pipe is 3 cm. The velocity of water in the pipe is 6 cm per second. A classmate went to wash his hands and forgot to turn off the faucet when he left. Please do the math, how much water is wasted by this faucet every minute?
自来水管的内直径是3厘米．水管中水的流速是每秒6厘米．一位同学去洗手，走时忘了关水龙头，请你算一算，这个水龙头每分钟浪费多少水？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4) * 6 * 60</gadget>
<output>2_543.4</output>

<result>2_543.4</result>