A piece of iron wire is 36 cm long, and the largest square is surrounded by it, what is the side length of the square in cm?
一根铁丝长36厘米，用它围成最大的正方形，正方形的边长是多少厘米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>