I have a quite tricky geometry problem to solve, and I don't find the answer. Here is the problem:
I have two concentric circles of known radii (r for the inner circle and R for the outer one). Between those circles, there is a segment which cuts the circles. We know the angle (alpha) between the segment and a line perpendicular to the cirlces passing through the point of the segment on the outer circle.
With this, we want to know the angle made by segment and the perpendicular line of the inner circle.
The motivation is to investigate on the refraction of light through circular tubes.
The picture of my problem is given below
Thank you all :)
Simon
