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If the orthocenter of an isosceles trian...

If the orthocenter of an isosceles triangle lies on the incircle of the triangle then A) the base angle of the triangle is `cos^-1 2/3` B) the triangle is acute C) the base angle of the triangle is `tan^-1 (sqrt5/2)` D) If S, I are the circumcentre and incentre and R is circumradius then `SI/R=1/3`

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