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1. P=a*h
P=19cm*12cm=228m2
P=228 m2
2.
P=a*h
P=11,2 cm*57mm
11,2 cm=112mm
P=112mm*57mm=6384mm2
P=6384mm2
3.
P=a*h
P=9cm*4cm=36cm2
P=36cm2
4.
P=a*h
P=4m*7m=28cm2
P=28m2
5.
P=a*h
P=5dm*35cm
P=50cm*35cm=1750cm2
P=1750 cm2