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a=4m
b=6m
c=2,5m
h=?
Ob=a+b+c+h
4+6+2,5+h=14
12,5+h=14
h=14-12,5=1,5m
P=(a+b)·h:2
P=(4+6)·1,5:2=10·1,5:2=7,5m²