Cut 4 meters from a cylindrical steel with a cross-sectional diameter of 6 decimeters, and the steel weighs 7.8 kilograms per cubic decimeter. How many kilograms does the cut piece of steel weigh?
从一根截面直径是6分米的圆柱形钢材上截下4米，每立方分米钢重7.8千克，截下的这段钢重多少千克？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">7.8 * 3.14 * 9 * 4 * 10</gadget>
<output>8_817.12</output>

<result>8_817.12</result>