A wire can enclose a square with a side length of 9 cm. If it is changed to enclose an equilateral triangle, how many centimeters is the side length of the equilateral triangle?
一根铁丝可以围成一个边长为9厘米的正方形，如果改围一个等边三角形，那么等边三角形的边长是多少厘米？
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>