If two rectangles with a length of 6 cm and a width of 3 cm are used to form a square, what is the area of the resulting square?
用两个长6厘米，宽3厘米的长方形，拼成一个正方形，拼成的正方形的面积是多少？
<gadget id="calculator">6 * 3 * 2</gadget>
<output>36</output>

<result>36</result>