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9+b^2=25
b^2=25-9=16 / pierwiastek
b=4cm
(a*h/2)*2=(4*3/2)*2=12cm^2
31,5cm^2 - 12cm^2=19,5cm^2
3*b=19,5 / podzielone przez 3
b=6,5cm
obw=5*2+4*2+6,5*2=31cm