By A Mystery Man Writer
How to construct the orthocenter of a triangle with compass and straightedge or ruler. The orthocenter is the point where all three altitudes of the triangle intersect. An altitude is a line which passes through a vertex of the triangle and is perpendicular to the opposite side. A Euclidean construction
Orthocenter - Definition, Properties, Formula, Examples, FAQs
Construction
File:Orthocenter of obtuse triangle.svg - Wikipedia
Orthocenter: Definition, Formula, How to Construct with Example
geometry - Prove that line through intersection of line through foots of heights and opposite line and orthocenter is perpendicular to median. - Mathematics Stack Exchange
Printable instructions for finding the orthocenter of a triangle with compass and straightedge or ruler
How to draw a triangle with sides 4, 3 1/2, and 3 in., and construct its circumcenter, centroid, incenter, and orthocenter - Quora
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Orthocenter - MathBitsNotebook (Geo)