There is a rectangle whose length and width are two adjacent even numbers and whose area is 168cm**2, what is its perimeter?
有一个长方形，长和宽是相邻的两个偶数，面积是168cm**2，它的周长是多少．
<gadget id="calculator">14 + 12</gadget>
<output>26</output>

<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<result>52</result>