piece of square steel is 3 meters long and its cross section is a square with a side length of 2 decimeters. What is the volume of this piece of square steel?
一段方钢长3米，横截面是边长2分米的正方形，这段方钢的体积是多少？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">2 * 2 * 30</gadget>
<output>120</output>

<result>120</result>