Cut off the four corners of a square with a side length of 1dm to form a square with a side length of 2cm. What is the perimeter of the figure?
把边长是1dm的正方形四个角各剪去边长为2cm的正方形，现在图形的周长是多少．
<gadget id="calculator">1 * 4</gadget>
<output>4</output>

<result>4</result>