A rectangle with a length of 4 cm and a width of 3 cm is enlarged by 2:1, what is the area after the enlargement?
一个长是4厘米、宽是3厘米的长方形按2：1放大，放大后的面积是多少平方厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

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

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<result>48</result>