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i) Take 'O' as the origin, let OA= a OB=5 and OC = 7 A OD = 577 -(1) :: OA+ OB+ OC = OA +2 (OD) By (1) = OA+AH= OH (:: AH =2 R cos A, OD = R cos A, R is the circum radius of A ABC and hence AH = 2 (OD)) ii) HA + HB + HC =HA + 2HD = HA + 2(HO+OD) = HA +2 HO+ 2 OD = HA + 2 HO + AH = 2 HO 11 Letā, b, c and d be the position vectors of A, B,C and Drespectively which are the

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