P is the circumcentre of an acute angled triangle ABC with circumradius R. Midpoint of BC is D. Show that the perimeter of △ABC is 2R (SinA + SinB + SinC).
In the adjoining figure, AD is the bisector of the exterior angle A of triangle ABC. Seg AD intersects the side BC produced in D. Prove that: BD/CD=AB/AC.
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