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Pc = 3 * 3 + 4 * 5 * 5
Pc = 9 + 4 * 25
Pc = 9 + 100
Pc = 109 cm kwadratowych
Pp = 3²
Pp = 9 cm²
Pb = 4 * ½ * a * h
Pb = 2 * 3 * 5
Pb = 30 cm²
Pc = Pp + Pb
Pc = 9 cm² + 30 cm²
Pc = 39 cm²
Myślę , że dobrze .