If a wire forms a square with side length 3 cm, what is the side length of an equilateral triangle?
一根铁丝围成边长3厘米的正方形，改为等边三角形边长多少厘米．
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>