If the waist length of the isosceles triangle ABC is 3cm and the vertex angle is 120 degrees, the diameter of its circumscribed circle is
The results show that: 1. The base is 3-178; + 3-178; - 2.3.3cos 120 ° = 27
Bottom = 3 √ 3
½ diameter = 3 √ 3 / sin120 ° = 6
Ψ diameter = 12
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