If a 100 cm long iron wire is used to form a largest square, what is the side length of the square in cm?
用一根100厘米长的铁丝围成一个最大的正方形，正方形的边长是多少厘米．
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<result>25</result>