Two adjacent sides of a parallelogram surrounded by a wire are 9 cm and 6 cm long. If the wire is used to form an equilateral triangle, what is the length of the sides of the equilateral triangle?
用一根铁丝围成平行四边形的相邻两条边分别长9厘米和6厘米．如果用这根铁丝围成一个等边三角形，这个等边三角形的边长是多少厘米．
<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<result>10</result>