The length of a rectangle is 10 cm, and the largest square is cut off with its width as one side. What is the perimeter of the remaining rectangle in cm?
一个长方形的长是10cm，以其中宽为一边剪去一个最大的正方形，剩下的长方形的周长是多少cm．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>