A piece of cuboid steel is 2 meters long and its cross-section is a square with side length 6 cm. The weight of steel per cubic centimeter is 7.8 grams. What is the weight of this square steel in kilograms?
一段长方体钢材，长2米，横截面是边长6厘米的正方形．每立方厘米钢重7.8克，这块方钢重多少千克．
<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">6 * 6 * 2 * 100 * 0.0078</gadget>
<output>56.16</output>

<result>56.16</result>