'In a ` A B C ,\ B M\ a n d\ C N` are perpendiculars from `B\ a n d\ C` respectively

"In a ` A B C ,\ B M\ a n d\ C N`
are perpendiculars from

`B\ a n d\ C`
respectively on any

line passing through `Adot`
If `L`
is the mid-point of `B C`
, prove that `M L=N L`
."