if sum of two sides of a triangle is x a...

if sum of two sides of a triangle is x and the product of those sides is y and third side is c such that `x^2 -c^2 =y` then circum radius of `Delta` is (A) `y/sqrt3` (B) `c/sqrt3` (C) `(3y)/4` (D)` (3c)/4`

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