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Construct a line segment RT parallel to SP which intersects the extended line segment QP at point T
Given that, PS is the angle bisector of ∠QPR.
∠QPS = ∠SPR (i)
By construction,
∠SPR = ∠PRT (As PS || TR) (ii)
∠QPS = ∠QTR (As PS || TR) (iii)
Using these equations, we get:
∠PRT = ∠QTR
PT = PR
By construction,
PS || TR
By using basic proportionality theorem for ΔQTR,
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