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In geometry, a triangle center or triangle centre is a point in the triangle's plane that is in some sense in the middle of the triangle. For example, the centroid, circumcenter, incenter and orthocenter were familiar to the ancient Greeks, and can be obtained by simple constructions.
A triangle showing its circumcircle and circumcenter (black), altitudes and orthocenter (red), and nine-point circle and nine-point center (blue) In geometry, the nine-point center is a triangle center, a point defined from a given triangle in a way that does not depend on the placement or scale of the triangle.
The isogonal conjugate of the orthocenter is the circumcenter of the triangle. [10] The isotomic conjugate of the orthocenter is the symmedian point of the anticomplementary triangle. [11] Four points in the plane, such that one of them is the orthocenter of the triangle formed by the other three, is called an orthocentric system or ...
The orthocenter of a triangle, usually denoted by H, is the point where the three (possibly extended) altitudes intersect. [1] [2] The orthocenter lies inside the triangle if and only if the triangle is acute. For a right triangle, the orthocenter coincides with the vertex at the right angle. [2]
orthocenter: intersection of the three altitudes: X(5) nine-point center: center of the nine-point circle: X(6) symmedian point: intersection of the three symmedians: X(7) Gergonne point: symmedian point of contact triangle X(8) Nagel point: intersection of lines from each vertex to the corresponding semiperimeter point X(9) Mittenpunkt
If P is the orthocenter, then LMN is the orthic triangle. If P is the incenter, then LMN is the intouch triangle. If P is the circumcenter, then LMN is the medial triangle. If P is on the circumcircle of the triangle, LMN collapses to a line (the pedal line or Simson line). Special case: P is on the circumcircle.
the orthocentre, the intersection of the triangle's three altitudes; and the nine-point centre , the centre of the circle that passes through nine key points of the triangle. For an equilateral triangle , these are the same point, which lies at the intersection of the three axes of symmetry of the triangle, one third of the distance from its ...
However, while the orthocenter and the circumcenter are in an acute triangle's interior, they are exterior to an obtuse triangle. The orthocenter is the intersection point of the triangle's three altitudes, each of which perpendicularly connects a side to the opposite vertex. In the case of an acute triangle, all three of these segments lie ...