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30=2(2x+2)+2x
30=4x+4+2x
26=6x
x=4 i 1/3
2x+2=10 i 2/3
P=2(10 i 2/3 + 4 i 1/3)=2 * 15= 30[dm²]
rzeczywistość - w skali
1dm - 0,5dm
1dm² -0,25dm²
30dm² -z
z=30 * 0,25
z=30/4=7,5 [dm²]