A square paper with a side length of 4 cm is cut into two identical rectangles, what is the perimeter of each rectangle in cm?
把一条边长4厘米的正方形纸劈成两个完全相同的长方形，每个长方形的周长是多少厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>