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If R is the radius of the circumcircle of the triangle ABC and delta is its area , then

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Solution:    Area of the triangle ,

                 ABC(Delta )=fracbc2sin A.   From the sine formula ,

                 a=2Rsin ARightarrow sin A=fraca2R .

       Rightarrow      Delta =frac12bc.fraca2R=fracabc4RRightarrow R=fracabc4Delta .

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Deependra Verma

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