A wire 120 cm long is used to form the largest square, what is the side length of this square in cm?
用一根长120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">120 / 4</gadget>
<output>30</output>

<result>30</result>