Divide a square with a side length of 6 cm into 2 rectangles, what is the perimeter of each rectangle in cm?
把边长为6厘米的正方形，平均分成2个长方形，其中每个长方形的周长是多少厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>