How to construct (draw) the orthocenter of a triangle- Math Open Reference

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

The Orthocenter – GeoGebra

Does an obtuse angle triangle have an orthocenter? - Quora

Orthocenter: Definition, Formula, How to Construct with Example

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

Orthocenter - MathBitsNotebook (Geo)

How to construct (draw) an isosceles triangle given base and altitude with compass and straightedge or ruler - Math Open Reference

Incircle and excircles - Wikipedia

Does an obtuse angle triangle have an orthocenter? - Quora

Orthocenter - MathBitsNotebook (Geo)

How to prove that you can draw a triangle inside a triangle whose orthocenter is the main triangles circumcenter - Quora