Mathematics

Mathematics

Problem

A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠BEC=130∘\angle BEC = 130^\circ and ∠ECD=20∘\angle ECD = 20^\circ, then ∠BAC\angle BAC is _______. ![Diagram showing a circle with points A, B, C, D on the circumference. Chords AC and BD intersect at point E inside the circle. Angle BEC is marked as 130 degrees. Angle ECD is marked as 20 degrees.](https://storage.googleapis.com/diraq-contents/homework-question-parsing/marker/20260106T182719Z/154e3cdc07d74b65b97af4710884c829/64662465bba247703fdec49c8f3309f9_img.jpg) (A) 110∘110^\circ (B) 100∘100^\circ (C) 90∘90^\circ (D) 120∘120^\circ

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