I hope this came out clear enough for you.
The problem with this question is that you have to think in 3 dimensions instead of two.
The picture I've drawn has replaced "the hill" from the question with "a flagpole". Same ideas obviously, just easier to draw.
If this image doesn't make much sense to you, let me know and i'll give it another shot with an isometric view instead of an oblique view like the one I've drawn.