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b=4cm
h=5cm
c=13cm
P=?
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p=(a+b)h/2
obw=a+b+c+h
a+b+c+h=38
a=38-(b+c+h)=38-(4+13+5)=38-22=16
P=(16+4)*5/2=50cm²
ODP
P=50cm²