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P = a²√3/4
16√3 = a²*√3/4/*4
64√3 = a²√3/:√3
a² = 64
a = √64
a = 8
b² = 8² + 8²
b² = 64 + 64
b² = 128
b = √128
b = √64*2
b = 8√2
Obw = 8√2*2 + 8 + 8 = 32√2