A cylindrical steel bar is 5 meters long and has a cross-sectional radius of 10 cm. It is known that the steel weighs 7.8 grams per cubic decimeter. How many kilograms does this steel bar weigh?
一根圆柱形钢条，长5米，横截面半径10厘米，已知每立方分米钢重7.8克千克，这根钢条重多少千克？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 5 * 10 * 7.8</gadget>
<output>1_224.6</output>

<result>1_224.6</result>