A piece of steel can be used to make a cylindrical part with a base diameter of 8 cm and a height of 9 cm. If it is transformed into a conical part with a height of 12 cm, what is the area of the bottom of the part in square centimeters?
有一段钢可做一个底面直径8厘米，高9厘米的圆柱形零件．如果把它改制成高是12厘米的圆锥形零件，零件的底面积是多少平方厘米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 9</gadget>
<output>452.16</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">452.16 * (1/4)</gadget>
<output>113.04</output>

<result>113.04</result>