Hello, frankinaround!

Why absolute value? . Because distance is a positive measure.

I get that hes putting the points into the slope of the other one . What?

to get maybe a parallel line, but thats all I get.

Why the sqrt of (A^2+B^2) ? . Why not?

You're expected tothat formula, aren't you?derive

Well,do it. . . and you'll see why.