Given: RSTU is a parallelogram.
Prove: ∠STR ≅ ∠UTR
Since it is given that RSTU is a parallelogram and SU is perpendicular to RT, then RSTU is a
Therefore, RT and SU are
So, ∠STR = ∠UTR by
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Definition of Angle Bisectors
Definition of Congruent
Definition of Perpendicular