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A point D is inside a triangle ABC (figure below) such that angle ACD = angle BCD = angle CAD = 10 degrees, and angle BAD = 20 degrees. Find the measure of angle CBD.This entry contributed by Ajit Athle.

See also: Triangles Angles Angle Bisector Congruence Solution Kaleidoscope of Problem 1146 base on Poincare Disk Model. Kaleidoscope of Geometry Problem 1146, iPad Productivity Apps; Adobe Spark Post Puzzle of problem 1146 (35 quadrilateral pieces)

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