A piece of square steel has a square cross section, its perimeter is 2 decimeters, and the length of the square steel is 6 decimeters. It is known that steel weighs 7.8 kilograms per cubic decimeter, how many kilograms does this piece of square steel weigh?
一段方钢，横截面是正方形，其周长是2分米，方钢长6分米．已知每立方分米钢重7.8千克，这段方钢重多少千克？
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2) * 6 * 7.8</gadget>
<output>11.7</output>

<result>11.7</result>