cylindrical steel part with a bottom radius of 3 cm and a height of 4 cm is cast into a conical part with a height of 12 cm. What is the area of the bottom of this part in square centimeters?
把一个底面半径是3厘米，高是4厘米的圆柱形钢件铸造成一个高是12厘米的圆锥形零件，这个零件的底面积是多少平方厘米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">113.04 / (1/3) / 12</gadget>
<output>28.26</output>

<result>28.26</result>