A cylindrical steel pipe has an inner diameter of 4 cm and an outer diameter of 8 cm. Its length is 6 meters. The steel weighs 7.8 grams per cubic centimeter. How many kilograms does this steel weigh?
一根圆柱形钢管，内直径4厘米，外直径是8厘米，它的长是6米，每立方厘米钢重7.8克，这根钢重多少千克？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<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">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">50.24 - 12.56</gadget>
<output>37.68</output>

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

<gadget id="calculator">37.68 * 6 * 100 * 0.0078</gadget>
<output>176.3424</output>

<result>176.3424</result>