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Pb = Pc - Pp = 384- 64 = 320 cm²
Pb = 2 * a * h
320 = 2 * 8 * h
320 = 16 * h / 16
h = 20
a²= 64 /√
a = 8
sory dalej nie wiem jak przebrnąc mam nadzieje że troche pomogłem,