Use two identical rectangles to form a square. The length of the rectangle is 4 meters and the width is 2 meters. What is the perimeter of the square?
用两个同样的长方形，拼成一个正方形，长方形的长是4米，宽是2米，拼成的正方形周长多少米？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>