In a scalene acute

MATHEMATICS · Subjective · ISC · Mathematics · Coordinate Geometry · Coordinate Geometry

Problem

In a scalene acute △ABC\triangle ABC, it is known that the line joining the circumcentre and orthocentre is parallel to BCBC. Prove that A∈(π3,π2)A\in\left(\frac{\pi}{3},\frac{\pi}{2}\right).

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