If a line segment joining two points subtends equal angles at two other points lying on the same side of the line segment; the four points are concyclic.
Text Solution
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Since `A`,`B`,`C` are non-collinear, one circle passes through them. raw a circle with center `O`.
Let `D` not lie on circle. Let circle intersect `AD` at `D'`.
`/_ACB=/_AD'B` (Angle in same segment)
But, `/_ACB=/_ADB`
Thus,
`/_AD'B=/_ADB`
This may only happen if and only if `D` and `D'` coincides. Thus, point `D` lie on circle.
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