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If a line meets two parallel lines and is perpendicular to one of them, prove that it is perpendicular to the other.

 

Answer below in the comments if you want! laugh

 Sep 19, 2018
edited by FreezingTNT  Sep 19, 2018
edited by FreezingTNT  Sep 19, 2018
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If a line meets two parallel lines and is perpendicular to one of them, prove that it is perpendicular to the other.

 

If two parallel lines are cut by a transversal then the cointerior angles are supplementary.

(If one is x the other is 180-x)

If one is 90 then thte other is 180-90=90.

So if the transversal is perpendicular to one of the lines it must be perpendicular to the other as well.

 Sep 19, 2018

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