A month ago I've posted this question, now I realized that there are some problems with y coordinates.
This is the problem. I have a circle with center at (cx, cy) and the heights hA, hB, hC, hD of the circular segments A, B, C and D.
I would like to find the coordinates of the points a, b, c, d, ... , k.
The problem is the y coordinates of those points.
How can I compute them?
The user Gribouillis answers that a generic point on circumference has coordinates $(x, y) = (x, c_y + r - h)$ but I don't think that $c_y + r -h$ is right.