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Let-H-be-orthocenter-of-ABC-and-O-its-circumcenter-Prove-that-the-vectors-OA-OB-OC-and-OH-satisfy-the-following-equality-OA-OB-OC-OH-




Question Number 16748 by Tinkutara last updated on 26/Jun/17
Let H be orthocenter of ΔABC and O  its circumcenter. Prove that the vectors  OA^(→) , OB^(→) , OC^(→)  and OH^(→)  satisfy the  following equality:  OA^(→)  + OB^(→)  + OC^(→)  = OH^(→)
$$\mathrm{Let}\:{H}\:\mathrm{be}\:\mathrm{orthocenter}\:\mathrm{of}\:\Delta{ABC}\:\mathrm{and}\:{O} \\ $$$$\mathrm{its}\:\mathrm{circumcenter}.\:\mathrm{Prove}\:\mathrm{that}\:\mathrm{the}\:\mathrm{vectors} \\ $$$$\overset{\rightarrow} {{OA}},\:\overset{\rightarrow} {{OB}},\:\overset{\rightarrow} {{OC}}\:\mathrm{and}\:\overset{\rightarrow} {{OH}}\:\mathrm{satisfy}\:\mathrm{the} \\ $$$$\mathrm{following}\:\mathrm{equality}: \\ $$$$\overset{\rightarrow} {{OA}}\:+\:\overset{\rightarrow} {{OB}}\:+\:\overset{\rightarrow} {{OC}}\:=\:\overset{\rightarrow} {{OH}} \\ $$
Commented by mrW1 last updated on 26/Jun/17
it would be a great help when you  post a question as well as the diagram  to it if available.
$$\mathrm{it}\:\mathrm{would}\:\mathrm{be}\:\mathrm{a}\:\mathrm{great}\:\mathrm{help}\:\mathrm{when}\:\mathrm{you} \\ $$$$\mathrm{post}\:\mathrm{a}\:\mathrm{question}\:\mathrm{as}\:\mathrm{well}\:\mathrm{as}\:\mathrm{the}\:\mathrm{diagram} \\ $$$$\mathrm{to}\:\mathrm{it}\:\mathrm{if}\:\mathrm{available}. \\ $$
Commented by mrW1 last updated on 26/Jun/17
I don′t mean special questions. It is  generally helpful if diagram could also  be posted together with the question.
$$\mathrm{I}\:\mathrm{don}'\mathrm{t}\:\mathrm{mean}\:\mathrm{special}\:\mathrm{questions}.\:\mathrm{It}\:\mathrm{is} \\ $$$$\mathrm{generally}\:\mathrm{helpful}\:\mathrm{if}\:\mathrm{diagram}\:\mathrm{could}\:\mathrm{also} \\ $$$$\mathrm{be}\:\mathrm{posted}\:\mathrm{together}\:\mathrm{with}\:\mathrm{the}\:\mathrm{question}. \\ $$

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