piece of round steel is 1.8 meters long, has a base radius of 5 centimeters, and weighs 7.8 kilograms per cubic decimeter. How many kilograms does this piece of round steel weigh?
一段圆钢长1.8米，底面半径为5厘米，每立方分米重7.8千克．这段圆钢重多少千克？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1.8 * 10</gadget>
<output>18</output>

<gadget id="calculator">3.14 * (1/4) * 18 * 7.8</gadget>
<output>110.214</output>

<result>110.214</result>