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We investigate the sensitivity with which two angles of the "flat" unitaritytriangle, defined by $V_{ub}^* V_{us} + V_{cb}^* V_{cs} + V_{tb}^* V_{ts} =0$,can possibly be measured directly at FCCee. We show that the measured errors onthe angle $\alpha_s = \arg(- V_{ub}^* V_{us} /V_{tb}^* V_{ts})$ and $\beta_s =\arg(-V_{tb}^* V_{ts} / V_{cb}^* V_{cs})$ should be better than $0.4^\circ$ and$0.035^\circ$, respectively. These measurements, combined with the measurementof the 3rd angle $\gamma_s = \arg(- V_{cb}^* V_{cs}/ V_{ub}^* V_{us})$,discussed in a different paper, will contribute to probe further theconsistency of the CP sector of the Standard Model with unprecedented level ofaccuracy.

CP violation and determination of the $bs$ "flat" unitarity triangle at FCCee