# How to find theta between 3 circles

So here's a very ugly sketch of the question I'm trying to solve: Any assistance would be greatly appreciate! Thank you so much : 3

• Are all the lines going out in the center of the circles? Aug 7, 2016 at 20:07
• Yes. I'm sorry that the ugly drawing doesn't properly show that. I wish I knew how to more formally draft this question Aug 7, 2016 at 20:08
• Are D(1), D(3) and D(5) parallel? Try to solve it in "parts" by splitting the angel into 3, connecting D(5) to the edges of the diameters.
– Moti
Aug 7, 2016 at 20:11
• I'm not exactly sure how that would be done Moti : ( And D1, D2, and D3 are supposed to show that I know the diameter of the circle, and D4 is the distance between the edges of Circles 3 and Circles 4 Aug 7, 2016 at 20:14
• You should better defined D5: if it is the minimum distance between the circles then an easy solution can be found, but this don' t correspond to your sketch. Another solution can be found if D5 is the distance between the topmost point of circle 3 and the lowest point of circle 4, but this solution depends upon a coordinate system and so it does not seem to fit your question.
– N74
Aug 7, 2016 at 21:40