If a transversal intersects two lines such that the bisectors of a pair of corresponding angles are parallel then prove that the two lines are parallel.
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given: A transversal AB intersects two lines PQ and RS such that ∠ PLM = ∠ SML
To prove: PQ || RS
Proof: ∠ PLM = ∠ SML (given) ....... (i)
∠ SML = ∠ RMB ....... (ii) (vertically opposite angles)
From equations (i) and (ii),
∠ PLM = ∠ RMB
As these are corresponding angles and corresponding angles equal only if given lines PQ and RS are parallel.
∴ PQ || RS
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