A piece of iron wire forms an isosceles triangle with a waist length of 4.5 cm and a base length of 6 cm. If the iron wire forms an equilateral triangle, what is the length of the sides of the equilateral triangle?
一根铁丝围成一个等腰三角形，腰长为4.5厘米，底边长为6厘米．如果把这根铁丝围成一个等边三角形，等边三角形的边长是多少厘米？
<gadget id="calculator">4.5 * 2</gadget>
<output>9</output>

<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>