cylindrical steel piece with a radius of 12cm and a height of 18cm is melted and cast into a conical steel piece with a height of 6dm. What is the bottom area of the conical steel piece?
把一个半径是12cm，高是18cm的圆柱形钢件熔铸成一个高是6dm的圆锥形钢件，这个圆锥形钢件的底面积是多少？
<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * 144 * 18 * (1/2)</gadget>
<output>4_069.44</output>

<result>4_069.44</result>