A piece of iron wire with a length of 72 cm encloses the largest square, what is the side length of this square in cm?
一段长72厘米的铁丝围成一个最大的正方形，这个正方形的边长是多少厘米？
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>