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! **

FreezingTNT Sep 19, 2018

#1**+1 **

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.

Melody Sep 19, 2018