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The three altitudes of a triangle intersect at the orthocenter, which for an acute triangle is inside the triangle.. The orthocenter of a triangle, usually denoted by H, is the point where the three (possibly extended) altitudes intersect.
List of letters used in mathematics and science; Glossary of mathematical symbols; List of mathematical uses of Latin letters; Greek letters used in mathematics, science, and engineering; Physical constant; Physical quantity; International System of Units; ISO 31
A branch of physics that studies atoms as isolated systems of electrons and an atomic nucleus. Compare nuclear physics. atomic structure atomic weight (A) The sum total of protons (or electrons) and neutrons within an atom. audio frequency A periodic vibration whose frequency is in the band audible to the average human, the human hearing range.
Orthocentric system.Any point is the orthocenter of the triangle formed by the other three. In geometry, an orthocentric system is a set of four points on a plane, one of which is the orthocenter of the triangle formed by the other three.
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.
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 ...
All tetrahedra can be inscribed in a parallelepiped.A tetrahedron is orthocentric if and only if its circumscribed parallelepiped is a rhombohedron.Indeed, in any tetrahedron, a pair of opposite edges is perpendicular if and only if the corresponding faces of the circumscribed parallelepiped are rhombi.
Hazard symbols; List of mathematical constants (typically letters and compound symbols) Glossary of mathematical symbols; List of physical constants (typically letters and compound symbols) List of common physics notations (typically letters used as variable names in equations) Rod of Asclepius / Caduceus as a symbol of medicine