A cylindrical piece of steel is 20 decimeters long and has a base radius of 6 decimeters. If the steel weighs 7.8 kilograms per cubic decimeter, how many kilograms does the steel weigh?
一根圆柱形钢材，长20分米，底面半径是6分米，若每立方分米钢重7.8千克，这根钢材重多少千克？
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36 * 20 * 7.8</gadget>
<output>17_634.24</output>

<result>17_634.24</result>