draw vertical line downwards

Hi,
Having trouble drawing a vertical line in downward direction.
Tried @x,180 and @x, -180.
I give up.
Help please

line->two points, select first point, then
@lenght<angle , like @90<270
HTH
Pere

@0,-180

Problem solved.
Simply use '-' to go down without using @.
Arrgh!
Sorry for the bother.

Thank you. Will copy your response into my learning list.