What are the structure of cyclic trimer of SO3 , Methylcyclotrisilicone, Cyclotrimetaphosphate and cyclotrisilicate ion ?

Important fact: that cyclic trimer of Methyltrisilicone [(CH₃)₆SiO₃] is isoelectronic with of timer of SO₃ (S₃O₉),Si₃O₉^-6,P₃O₉^-3 and contains 120 electrons.

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What are the structure of cyclic trimer of SO3 , Methylcyclotrisilicone, Cyclotrimetaphosphate and cyclotrisilicate ion ?