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P=12*16/2
P=96(cm²)
Ptrap.=(a+b)*h/2
P=(3+9)*4/2
P=24(cm²)
Pole trapezu=(3+9)*4 przez 2= 11*4/2=44/2=22
Pt = 1/2× (3+9)×4= 2×12=24cm
Pr- pole rombu
Pr=12+16/ 2= 14cm