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a=16m
b=?
P=144m^2
P=ab
b=P/a
b=144/16=9m
O=2(a+b)
O=2(16+9)=2*25=50m
2.
a=20cm
O=78cm
O=2a+2b
2b=O-2a
b=(O-2a)/2
b=(78-2*20)/2=(78-40)/2=38/2=19cm
P=ab
P=20*19=380cm^2