A rectangle with a length of 4 cm and a width of 2 cm is enlarged by 3:1, what is the area of the figure obtained?
一个长4厘米，宽2厘米的长方形按3：1放大，得到的图形面积是多少．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>