A steel pipe has an inner diameter of 6 cm, an outer diameter of 8 cm, and a length of 2 meters. What is the volume of this steel pipe?
一根钢管的内直径是6厘米，外直径是8厘米，长2米，求这根钢管的体积？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

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

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

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">50.24 - 28.26</gadget>
<output>21.98</output>

<gadget id="calculator">21.98 * 2 * 100</gadget>
<output>4_396</output>

<result>4_396</result>