The inner diameter of a cylindrical water pipe is 6 cm, the flow rate of water in the pipe is 10 cm per second, how much water flows in cm**3 per second.
一根圆柱形水管的内直径是6cm，水在管内的流速是每秒10cm，每秒流过的水量是多少cm**3．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 10</gadget>
<output>282.6</output>

<result>282.6</result>