en.wikipedia.org/wiki/Altitude_(triangle)

In geometry, an altitude of a triangle is a line segment through a vertex and
perpendicular to a line containing the base This line ...

www.mathopenref.com/triangleorthocenter.html

The altitude of a triangle (in the sense it used here) is a line which passes
through a vertex of the triangle and is perpendicular to the opposite side. There
are ...

jwilson.coe.uga.edu/EMAT6680Fa09/DeGeorge/Assign4TdeG/Orthocenters.html

The orthocenter of a triangle is the intersection of the three altitudes of a triangle.
Remember, the altitude of a triangle is a perpendicular segment from the vertex ...

www.ask.com/youtube?q=Orthocenter of a Triangle&v=cmVi6d45zOc

Jan 15, 2013 ... Finding the orthocenter of a triangle doesn't have to be the most difficult thing you
attempt to do in a day. Find the orthocenter of a triangle in ...

patch.com/new-jersey/wyckoff/find-orthocenter-of-a-triangle-geometry_eb93cdab

Jan 20, 2014 ... The orthocenter is the intersecting point for all the altitudes of the triangle. One of
the traditional questions in the Geometry class is to find the ...

formulas.tutorvista.com/math/orthocenter-formula.html

Orthocenter of a triangle is the point of intersection of all the altitudes of the
triangle. The orthocenter of a triangle is denoted by the letter 'O'. There is no
direct ...

math.stackexchange.com/questions/640081/why-is-it-called-an-orthocenter-what-is-the-orthocircle

Jan 16, 2014 ... We know that the orthocenter of a triangle is the place where the triangle's three
... The *in*center - the intersection of the triangle's three angle ...

www.vitutor.com/geometry/plane/orthocenter.html

Orthocenter. The orthocenter is the point of intersection of the three heights of a
triangle. Orthocenter. A height is each of the perpendicular lines drawn from one
...

www.mathwarehouse.com/geometry/triangles/triangle-concurrency-points/orthocenter-of-triangle.php

Orthocenter of a triangle. Explained with examples , illustrations and a cool
HTML5 Applet --for acutes, obtuse and right triangles.

mathworld.wolfram.com/Orthocenter.html

of a triangle is called the orthocenter. The name was invented by Besant and
Ferrers in 1865 while walking on a road leading out of Cambridge, England in
the ...