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Pc = 3cm*3cm +4 * (3cm*5cm/:2)
Pc= 9cm² + 4* 7,5 cm²
Pc= 9cm² +30 cm²
Pc = 39 [cm²]
Mam nadzieję, że pomogłem i proszę o najlepszą ;)
Pp = a²
Pp = 3² = 9 cm²
Pb =4 * ½ a * h
Pb = 4 * ½ 3 * 5
Pb = 30 cm²
Pc = 9 + 30 = 39cm²