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Question
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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