The area of a square is 36 square centimeters, what is the perimeter of the rectangle formed by two such squares?
一个正方形的面积是36平方厘米，两个这样的正方形拼成的长方形周长是多少．
<gadget id="calculator">6 + 6 + 6</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>