Question

If l,m,n are 3 lines such that l is parallel to m and n is perpendicular to l, then prove that n is perpendicular m.

Answer 1

Whenever 2 lines are parallel, a perpendicular bisector of one line also bisects the other line perpendicullarly, ie: the are mutually perpendicular. so if l || m and n is perpendicular to l, then l || m and n||l therefore m || n