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a√3 - przekątna
a√3 = 8 |:√3
a = 8/√3 * √3/√3
a = 8√3/3
Pc = 6a²
Pc = 6*(8√3/3)²
Pc = 6*[(64*3)/9]
Pc = 6*(192/9)
Pc = (2*192)/3
Pc = 384/3
Pc = 128 [cm²]