A square with a side length of 9 cm is surrounded by a piece of wire. Now change it into an equilateral triangle, and calculate it, if it is an equilateral triangle, how many centimeters should the sides be?
用一根铁丝围成了一个边长9厘米的正方形．现在把它改围成一个等边三角形，算一算，若围成等边三角形，边长应该是多少厘米？
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

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

<result>12</result>