Question 185
The diagonals of the parallelogram $ABCD$ intersect at the point $O$. The bisectors of the angles $DAC$ and $DBC$ intersect at the point $T$. It is known that $\overrightarrow{TD} + \overrightarrow{TC} = \overrightarrow{TO}$. Determine the measures of the angles of triangle $ABT$.