How to calculate anfle of inclination of the plane

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I have 3 points A, B and C and their coordinates (x y z), which form the plane, at the very beginning form an equilateral triangle(with the same value of the Z coordinate); points B and C can change their coordinates Z (up and down); How will the angle of inclination of the plane change and in which direction, if we change the coordinates Z point B and C (separately, not the same for both Zc and Zb). It has to work as a formula, because I have plenty of diffrent points A B and C. Any ideas how to do it?