A cylindrical steel pipe has an inner diameter of 8 cm, an outer diameter of 12 cm, and a length of 2 meters. What is the volume of this cylindrical steel pipe?
一个圆柱体钢管，内直径为8厘米，外直径为12厘米，长2米，求这个圆柱体钢管的体积是多少？
<gadget id="calculator">12 / 10 / 2</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) ** 2</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">3.14 * (9/25) * 2 * 10</gadget>
<output>22.608</output>

<gadget id="calculator">8 / 10 / 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) ** 2</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">3.14 * (4/25) * 2 * 10</gadget>
<output>10.048</output>

<gadget id="calculator">22.608 - 10.048</gadget>
<output>12.56</output>

<result>12.56</result>