There is a section of steel that can be made into a round steel with a bottom diameter of 8 cm and a height of 9 cm. If this section of steel is made into a conical part with a height of 12 cm, what is the area of its bottom in square centimeters?
有一段钢可做成一个底面直径8厘米，高9厘米的圆钢，如果把这段钢做成一个高12厘米圆锥形的零件，它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">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 / (1/3) / 12</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * 16 * (9/4)</gadget>
<output>113.04</output>

<result>113.04</result>