Air casan a ' cuideachadh dhut obrachadh a-mach an orthocenter an triantan.
An orthocenter an intersection point of the altitudes of a triantan no na leudachain is denoted by the litir (Cmsu), a-rèir an cruth triantan an orthocenter a bhith taobh a-staigh an triantan (eilean chanaigh-angled), a-muigh ' s e (ann am) no an aon àm le vertex (ann cumanta — coincident le vertex aig right angle).