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240 = √3 . a²
(240√3)/3
80√3 = a²
√80 . 3 = a
√4 . √20 . 3 = a
2 . 3 .√20 = a
6√20 = a
6 . √5 . √4 = a
6 . 2 . √5 = a
12√5 = a
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Octaedro
240 = 2√3 . a²
60√3 = a²
√60 . 3 = a
√4 . √15 . 3 =a
2 . 3 . √15 = a
6√15 = a