A section of cylindrical steel billet has a bottom radius of 0.1 meters and a length of 1 meter. If the steel weighs 7.8 tons per cubic meter, how many kilograms does this section of steel billet weigh?
一段圆柱形钢坯，底面半径是0.1米，长1米，如果每立方米钢材重7.8吨，这段钢坯重多少千克？
<gadget id="calculator">0.1 ** 2</gadget>
<output>0.01</output>

<gadget id="calculator">3.14 * 0.01 * 1 * 7.8 * 1_000</gadget>
<output>244.92</output>

<result>244.92</result>