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b=2
c=?
suma krawędzi=4a + 4b + 4c
4a + 4b + 4c=36
4·4 + 4·2 + 4c=36
16 + 8 + 4c=36
4c=36 - 16 -8
4c=12 /÷4
c=3
P₁= 2 · ab=2 ·4·2=16
P₂=2· ac=2· 4· 3= 24
P₃= 2 · bc= 2·2·3=12
Pc= 16 + 24 + 12=52 j²