If a square with a side length of 3 cm is enlarged by 2:1, what is the side length of the enlarged square in cm?
把一个边长为3厘米的正方形按2：1大，放大后的正方形的边长是多少厘米．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>