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256+x²=400
x²=144
x=√144
x=12
Pc=(16²√3) / 4 × 2 + 3 × 16 × 12 = 256√3 / 2 + 576 = 128√3 + 576
Odp. Pole powierzchni całkowitej tego graniastosłupa wynosi 128√3 + 576 cm²