You can specify angle overrides when drawing lines – sort of like a manual ORTHO or POLAR. After starting the line or polyline command, select the first point, then type in “<60” (or whatever angle you need). Your line is then constrained to draw in that direction – you can type in a distance or pick the next point. The third point can be in any direction; the override applies for only one segment. If you're using Dynamic Input, though, the default coordinate entry is (length, angle). You can hit TAB to move to the angle field, type your number, then TAB back to the length field and either click or type for the length. To switch to (X,Y) input, type the first number, then a comma, then the second number.