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ShareA triangle is one of the basic shapes of geometry: a polygon with three vertices and three sides which are straight line segments.
Any three non-collinear points determine a triangle and a unique plane, i.e.
two dimensional Cartesian space in Euclidean geometry.
From the systemics perspective, triangle is the structure of every system composed with three reciprocally connected/interrelated abstract or real objects.
For more information about the topic Triangle, read the full article at Wikipedia.org, or see the following related articles:
Hypotenuse of a right triangle — The hypotenuse of a right triangle is the triangle's longest side; the side opposite the right angle. The length of the hypotenuse of a right ... > read more
Antiprism — An n-sided antiprism is a polyhedron composed of two parallel copies of some particular n-sided polygon, connected by an alternating band of ... > read more
Tessellation — A tessellation or tiling of the plane is a collection of plane figures that fill the plane with no overlaps and no gaps. One may also speak of ... > read more
Parallelogram — A parallelogram is a four-sided plane figure that has two sets of opposite parallel sides. Every parallelogram is a polygon, and more specifically a ... > read more
Tetrahedron — A tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is ... > read more
Euclidean geometry — Euclidean geometry is a mathematical well-known system attributed to the Greek mathematician Euclid of Alexandria. Euclid's text Elements was the ... > read more
Angle — An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. Angles provide a means of expressing the ... > read more
Trigonometry — Trigonometry is a branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees ... > read more
Hyperbolic geometry — In mathematics, hyperbolic geometry is a non-Euclidean geometry, meaning that the parallel postulate of Euclidean geometry is rejected. The parallel ... > read more
Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Triangle at Wikipedia.org. See the Wikipedia copyright page for more details.
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