Cut out the largest square from a rectangle with a length of 30 decimeters and a width of 16 decimeters. What is the perimeter of this square in decimeters?
从一个长30分米，宽16分米的长方形上剪下一个最大的正方形，这个正方形的周长是多少分米？
<gadget id="calculator">16 * 4</gadget>
<output>64</output>

<result>64</result>