The end points of three diameters of three circles are involved in two cyclic quadrilaterals, purple and orange, separated by the green triangle. What is the angle α between the other (not diameter) diagonals of the two quadrilaterals?
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Solution
The angle α is 90°.
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Sorry: one more copy and paste mistake!
In line 6 replace (C1; M1; A2) by (A2; M1; B1).