Math, asked by rajeev7828, 9 months ago

If the bisector of a pair of alternate interior angle are parallel prove that given lines are parallel

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Answered by Anonymous
17

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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