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a) P=P1+P2+P3
P1=2cm*10cm=20cm^2
P2=4cm*2cm=8cm^2
P3=2*10cm=20cm^2
P=48cm^2
b)P=P1-P2-P3
P1=12cm*12cm=144cm^2
P2=1/2*4cm*8cm=16cm^2
P3=4cm*8cm=32cm^2
P=96cm^2
2.P=P1-2*P2-2*P3
P1=6m*6m=36m^2
P2=1/2*3m*2m=3m^2
P3=1/2*1,5m*4m=3m^2
P=24m^2