steel pipe is 150 cm long, has an outer diameter of 10 cm, and an inner diameter of 8 cm. What is its volume in cubic centimeters?
一根钢管长150厘米，外直径10厘米，内直径8厘米，它的体积是多少立方厘米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

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

<gadget id="calculator">3.14 * 9 * 150</gadget>
<output>4_239</output>

<result>4_239</result>