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==Izvori==
[http://math.about.com/od/glossaryofterms/g/Definition-Of-Altitude.htm Definition of Altitude]
 
[http://www.mathopenref.com/triangleorthocenter.html Orthocenter of a Triangle]
 
[http://gujarat-education.gov.in/textbook/Images/9sem2/maths-9eng/chap14.pdf HERON′˘S FORMULA]
 
[http://www.univer.omsk.su/omsk/Edu/Rusanova/triangls.htm Треугольники]
 
[http://www.dmi.uns.ac.rs/site/dmi/download/master/matematika/JelenaKnezevic.pdf Značajne tačke i linije u trouglu]
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