A piece of iron wire can just enclose an equilateral triangle whose side length is 12 centimeters. If this iron wire forms a square, what is the side length of the square in centimeters?
有一根铁丝正好能围成一个边长是12厘米的等边三角形，如果把这根铁丝围成一个正方形，正方形的边长是多少厘米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<result>9</result>