What is the perimeter of a square made of two rectangles with a length of 4 cm and a width of 2 cm?
用两个长4厘米、宽2厘米的长方形拼一个正方形，它的周长是多少厘米
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>