Cześć!
Pc=Pp+Pb
[tex]pb = 4 \times \frac{9 \times 4}{2} = 4 \times \frac{36}{2} = 4 \times 18 = 72 {cm}^{2} [/tex]
[tex]pp = 4 \times 4 = 16 {cm}^{2} [/tex]
[tex]pc = 72 {cm}^{2} + 16 {cm}^{2} = 88 {cm}^{2} [/tex]
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