A steel pipe 2m long has an outer diameter of 10cm and an inner diameter of 6cm. What is the volume of the steel pipe?
一根2m长的钢管，外直径是10cm，内直径是6cm，这根钢管的体积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">25 - 9</gadget>
<output>16</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">3.14 * 16 * 200</gadget>
<output>10_048</output>

<result>10_048</result>