"We are discussing I think a Waltz and to duplicate the action we will be doing if we are doing the rise and the fall in the Modern Waltz against a door. I am in bare feet. You can be in high heels. I believe the angle would be the same in both cases but obviously not at the start."
Then you obviuosly haven't really thought about it. Who is dancing? How strong are they? How stiff is the toe box of the shoe? Are they demonstrating, competing, social dancing, practicing? What tempo is the music? How big is the room? Is the floor crowded? What do they wish to communicate?
"Also over the three beats of music there will be from straight to bent knees twice."
Or once, or three times, or none at all. It all depends on the proportions of movement appropriate for the dancing that is to be done. As an obvious example, many dancers, from beginner through world finalist, will (for differing reasons) at times quite correctly not achieve fully straight legs in the three-to-one transition. In other situations they may achieve them not only there, but between one and two, flex somewhat, and then straighten again at the peak of the rise. Many possibilities that are correct, even for the same figure, all depending on the situation.
The key skill is not to memorize answers (since those will be wrong as often as they are right) but to understand why the answer for a specific case is what it is, and why the answer for a slightly different case - even of the same figure - would have to be different.