If two squares with a side length of 4 cm are put together to form a rectangle, how many centimeters will the perimeter of this rectangle be reduced from the sum of the perimeters of the original two squares?
把2个边长是4厘米的正方形拼成一个长方形，这个长方形的周长比原来两个正方形周长和减少了多少厘米
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>