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Answer:
to prove: angle QPR = 1/2 angle QTR
proof: by exterior angle property in angle QTR
angle p + angle q = angle PRS
angle p + (angle 1 + angle 2) = (angle 3 + angle 4)
(given angle 1= angle 2 and angle 3= angle 4)
angle p + angle 2 angle 2 = 2 angle 4
angle p = 2 angle 4 - 2 angle 2
angle p = 2(angle 4 - angle 2)---eqn. 1
again by exterior angle property in angle QTR
angle t + angle 2 = 4
angle t = angle 4 - angle 2---eqn. 2
from eqn. 1 and 2
angle p = 2(angle t)
1/2 angle p = angle t
1/2 angle QPR = angle QTR
[hence proved]
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