Slope of the spherical cap

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I have a full spherical cap (lower part), with a known R and h. It is located on three needles at points A, B and C, which form an equilateral triangle and have the same coordinates Z. Point A and B are fixed, point C can move on the line formed by the AC points (x coordinate, y and z can be calculated because it moves on the sphere, how?). How the slope of the base plane will change by changing the position of point C. Any ideas how to do it?