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p=(9+6√3+1+20):2=15+3√3
P=√[p(p-a)(p-b)(p-c)]
P=√[(15+3√3)(15+3√3-9-6√3)(15+3√3-1)(15+3√3-20)]
P=√[(15+3√3)(6-3√3)(14+3√3)(3√3-5)]
P=√[(90-45√3+18√3-27)(42√3-70+27-15√3)]
P=√[(63-27√3)(27√3-43)]
P=√(1701√3-2709-2187+1161√3)
P=√(2862√3-4896)
P=√[18(159√3-272)]
P=3√[2(159√3-272)]