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d2=x+6cm
P=1/2*d1*d2
P=1/2*x*x+6cm=56cm2
P=x+6cm=56cm2
x=56cm-6cm
x=50cm
50cm-d1
56cm-d2
obw=2*d1+2*d2
obw=2*50cm+2*56cm
obw=100cm+112cm=216cm