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P₁=15cm*8cm
P₁=120cm²
P₂-pole 4 wyciętych kwadratów
P₂=4*(2cm)²
P₂=4*4cm²
P₂=16cm²
pole figury
P₁-P₂=120cm²-16cm²=104cm²
O-obwód
O=2*11cm+2*4cm+8*2cm
O=22cm+8cm+16cm
O=46cm