If the bisector of a pair of alternate interior angle are parallel prove that given lines are parallel
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Given:
Here, as shown in the figure given below let AC be the bisector of ∠PAB and BD be the bisector of ∠ABS.
∴ ∠PAC = ∠CAB = x
∠ABD = ∠DBS = y
It is also given that AC║BD
⇒ ∠CAB = ∠ABD [Alternate angles are equal]
∴ x = y
⇒ 2x = 2y [ Multipying both the sides with 2 ]
⇒ ∠PAB = ∠ABS
∴ PQ║RS [Since alternate angles are equal, lines are parallel]
Hence proved.
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