The length of a rectangle is 20 decimeters and the width is 10 decimeters. If it is cut into two squares of the same size, what is the perimeter of each square?
一个长方形的长是20分米，宽是10分米，如果把它剪成两个一样大的正方形，每个正方形的周长是多少分米．
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>