A square iron wire with a side length of 18 cm is disassembled to form the largest equilateral triangle. What is the side length of this equilateral triangle in cm?
把一个边长为18厘米的正方形铁丝拆开围成一个最大的等边三角形，这个等边三角形的边长是多少厘米？
<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<gadget id="calculator">72 / 3</gadget>
<output>24</output>

<result>24</result>