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

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

Does an obtuse angle triangle have an orthocenter? - Quora

Orthocenter For the Love of Math – Geometry

Does an obtuse angle triangle have an orthocenter? - Quora

Orthocenter Formula coordinate geometry of triangle & proof

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

Orthocenter - MathBitsNotebook (Geo)

Construction

How to construct (draw) one of the three altitudes of a triangle - Math Open Reference

Orthocenter - MathBitsNotebook (Geo)