If a rectangle with a length of 8 cm and a width of 4 cm is cut into two identical squares, how many centimeters will the perimeter increase?
把一个长是8厘米，宽是4厘米的长方形，剪成完全一样的两个正方形，周长增加了多少厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>