A cylindrical steel pipe is 4 meters long, has an inner diameter of 8 cm, an outer diameter of 12 cm, and weighs 7.8 grams per cubic centimeter. What is the weight of this steel pipe in kilograms?
一根圆柱形钢管长4米，内直径是8厘米，外直径是12厘米，每立方厘米钢重7.8克，这根钢管的重量是多少千克？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

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

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">3.14 * 20 * 4 * 100 * 0.0078</gadget>
<output>195.936</output>

<result>195.936</result>