If two squares with side lengths of 3 cm are put together to form a rectangle, the perimeter of the resulting rectangle is how many centimeters less than the sum of the perimeters of the original two squares.
把两个边长是3厘米的正方形拼成一个长方形，拼成的这个长方形的周长比原来两个正方形的周长和少多少厘米．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>