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Obliczam b
a=3b
Ob=a+b+a+b+a+3b
Ob=3a+5b
Ob=3·3b+5b
Ob=9b+5b
Ob=14b
14b=280 /:14
b=20m
Obliczam a
a=3b
a=3·20
a=60m
Obliczam pole
P=(a+b)·a
P=(60+20)·60
P=80·60
P=4800m²
P=0,48ha