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r = ⅓h
h = 3*3√3cm = 9√3
h = a√3:2
9√3 = a√3:2 |*2
18√3 = a√3 |:√3
a = 18
P = a²√3:4
P = 18cm*18cm*√3:4 = 324√3:4 [cm²] = 81√3 [cm²]