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Neka je BORNA konveksni peterokut takav da je BO=BA=RN=1, \angle BOR=\angle NAB=90^\circ i OR+NA=1. Izračunaj površinu peterokuta.
Let BORNA be a convex pentagon such that BO=BA=RN=1, \angle BOR=\angle NAB=90^\circ and OR+NA=1. Compute the area of the pentagon.