A piece of iron wire is 90 cm long. Three equal equilateral triangles are surrounded by it. What is the side length of each triangle?
一根铁丝长90厘米，用它围成三个同样的等边三角形，每个三角形的边长是多少厘米？
<gadget id="calculator">90 / 3 / 3</gadget>
<output>10</output>

<result>10</result>