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 △BAC, Angle BAC= 90°, segment AD, seg BE and seg CF are medians. Prove: 2(AD²+BE²+CF²)=3BC²
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