Cut a square of side length 6 cm into two rectangles. By how many centimeters is the sum of the perimeters of the two rectangles greater than the square?
把一个边长是6厘米的正方形剪成两个长方形．两个长方形周长总和比正方形多了多少厘米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>