Cut out the largest square from a piece of cardboard with a length of 24 cm and a width of 15 cm. What is the perimeter of the square in cm?
从一张长24厘米，宽15厘米的纸板上剪下一个最大的正方形，正方形的周长是多少厘米．
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>