Fold a piece of paper with a side length of 8 cm into two rectangles, what is the perimeter of one of the rectangles in cm?
把一张边长是8厘米的正方形纸，对折成两个长方形，其中一个长方形的周长是多少厘米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>