Difference between revisions of "Triangle"
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Latest revision as of 18:57, 12 September 2016
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.
A triangle with vertices A, B, and C is denoted (triangle) ABC.
In Euclidean geometry any three points, when non-collinear, determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space).
See also
- Apollonius' theorem
- Congruence (geometry)
- Desargues' theorem
- Dragon's Eye (symbol)
- Fermat point
- Hadwiger–Finsler inequality
- Heronian triangle
- Inertia tensor of triangle
- Integer triangle
- Law of cosines
- Law of sines
- Law of tangents
- Lester's theorem
- List of triangle inequalities
- List of triangle topics
- Ono's inequality
- Pedal triangle
- Pedoe's inequality
- Polygon
- Pythagorean theorem
- Special right triangles
- Triangle center
- Triangular number
- Triangulated category
- Triangulation (topology)
External links
- Triangle @ Wikipedia
