There are 12 small squares with a side length of 1 cm to form a large rectangle, how to make the perimeter of the rectangle the smallest, and how many centimeters is the smallest.
有12个边长为1厘米的小正方形拼成一个大长方形，怎样拼才能使长方形的周长最小，最小是多少厘米．
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>