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180 - interior angle = exterior angle
By using Pythagoras' theorem for a right angle triangle.
There is no general formula. You need to measure it or else have a lot more information.
what is the formula for a vertical angle
The taper angle is the angle where a thread is tapered as it is created. The formula to find it is to subtract the small diameter from the large diameter and multiply by 28, then divide by the length of the taper.