A cuboid iron block with a length of 49 cm, a width of 4 cm, and a height of 3 cm is melted and cast into a cone with a height of 12 cm. What is the area of the base of the cone in square centimeters?
把一个长49厘米，宽4厘米，高3厘米的长方体铁块，熔铸成一个高12厘米的圆锥体，这个圆锥的底面积是多少平方厘米？
<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">49 * 4 * 3 * (1/4)</gadget>
<output>147</output>

<result>147</result>