If there are two identical rectangles with a length of 4 cm and a width of 2 cm, put them together to form a square, what is the perimeter of the square in cm
有两个一样的长方形，长4厘米，宽2厘米，把它们拼成一个正方形，这个正方形周长是多少厘米
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>