If two squares with side lengths of 3 cm are put together, what is the perimeter of the resulting figure in cm?
把两个边长为3厘米的正方形拼在一起，那么得到的图形的周长是多少厘米．
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

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

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

<result>18</result>