Four rectangles with a length of 4 cm and a width of 1 cm form a square, what is the perimeter of the square in cm
四个长4cm，宽1cm的长方形拼成一个正方形，正方形的周长是多少cm
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>