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A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted .
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Mara Triangle - Mara Triangle Blog
Help us protect the Mara Triangle in Kenya's Masai Mara. ... Mara Triangle Online. Mara Triangle Blog. Mara Vet. Galleries. Videos. Links. Public Forum ...maratriangle.org/blog/The Cuban Triangle
The Cuban Triangle. Havana-Miami-Washington events and arguments and their ... from the Federation of American Scientists' blog that links to two reports from ...cubantriangle.blogspot.com/blogs at the triangle
This website contains the blogs at The Triangle, the independent student newspaper of Drexel University in Philadelphia, PA. The blogs cover campus and city news ...blogs.thetriangle.org/the Triangle, not just parking lots anymore...
... local community developments in the Mt. Vernon Triangle area of Washington, DC's Mt. Vernon Square ... Roundup of recent 'hood related blog postings: ...mvtriangle.blogspot.com/Right Angles
NC blog list. Nothing Could Be Finer. Ogre's View. Sam's Notes. Silflay Hraka. Sister Toldjah ... Triangle bloggers. Betsy Newmark. Cary Politics. Confederate ...triangle.johnlocke.org/blog/A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted .
In Euclidean geometry any three non-collinear points determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space).
By relative lengths of sides
Triangles can be classified according to the relative lengths of their sides:
- In an equilateral triangle, all sides are the same length. An equilateral triangle is also a regular polygon with all angles equal to 60°.
- In an isosceles triangle, two sides are equal in length. (Traditionally, only two sides equal, but sometimes at least two.) An isosceles triangle also has two equal angles: the angles opposite the two equal sides.
- In a scalene triangle, all sides and internal angles are different from one another.
| Equilateral | Isosceles | Scalene |
By internal angles
Triangles can also be classified according to their internal angles, measured here in degrees.
- A right triangle (or right-angled triangle, formerly called a rectangled triangle) has one of its internal angles equal to 90° (a right angle). The side opposite to the right angle is the hypotenuse; it is the longest side in the right triangle. The other two sides are the legs or cathetiFact: date=February 2009 (singular: cathetus) of the triangle. Right triangles obey the Pythagorean theorem: the sum of the squares of the two legs is equal to the square of the hypotenuse: a2 + b2 = c2, where a and b are the lengths of the legs and c is the length of the hypotenuse. Special right triangles are right triangles with additional properties that make calculations involving them easier.
- Triangles that do not have a 90° internal angle are called oblique triangles.
- A triangle that has all the internal angles smaller than 90° is an acute triangle or acute-angled triangle.
- A triangle that has one angle larger than 90° is an obtuse triangle or obtuse-angled triangle.
- An equilateral triangle is an acute triangle with all three internal angles equal to 60°.
| Right | Obtuse | Acute |
