I have a problem as follows -
I have an arc, with a point on each end. And angle $a$ is how far the arc goes. I need to find the top right point ($P(w, x)$) in relation to the $r$, $P(x, y)$, and $a$ (Note that the x's in either points are not related; I just made a mistake in the diagram). I drew a diagram to better explain. What would describe it? (This is the diagram).