In a AABC, following relations hold good, In which case(s) the triangle is a right angled...

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In a AABC, following relations hold good, In which case(s) the triangle is a right angled triangle? (Assume all symbols have their usual meaning) (A) r2 + r3 = r1 -r (B) a? + b +c = 8R? (C) If the diameter of an excircle be equal to the perimeter of the triangle. (D) 2R = r1 - r In a AABC, following relations hold good, In which case(s) the triangle is a right angled triangle? (Assume all symbols have their usual meaning) (A) r2 + r3 = r1 -r (B) a? + b +c = 8R? (C) If the diameter of an excircle be equal to the perimeter of the triangle. (D) 2R = r1 - r