Point Snaps: Tangency Point and Measure

Hi everybody,

I have 2 questions realted to point snaps:

1- Tangency Point: I want to give a parallel dimension to the inclined line in the video clip below. If i select the end point of the line, it finds the exact point of tangency. However, if I select the tangent point it picks an irrelevant point. Am I doing something wrong?

2- Measure: When I use measure for a driving dimension, I cannot snap to any point on the sketch other than the origin. Am I using "measure" command incorrectly?

Ural