Forge a cuboid iron block with a side length of 6 decimeters into a cuboid part (the loss of the iron block is not counted in the forging process). The height of the cuboid part after forging is 4 decimeters. What is the area of the bottom of the part?
将一个棱长是6分米的正方体铁块锻造成一个长方体零件(在锻造过程中不计铁块损耗)，锻造后长方体零件的高是4分米，零件的底面积是多少平方分米？
<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 * 6 * (3/2)</gadget>
<output>54</output>

<result>54</result>