∵ O is centrc of regular hexagon
∵ O is the mid-point of each of the diagonals AD. BE. CF
In ∆ ABE, O is mid-point of BE
...(1)
In O is the mid-point of FC
...(2)
Also, ...(3)
as O is the mid-point of AD.
Adding (1), (2) and (3), we get,