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A '''Triangle''' is one of the basic shapes of [[geometry]] |
A '''Triangle''' is one of the basic shapes of [[geometry]]: a two-dimensional figure with three vertices and three sides, which are straight line segments. Triangles are studied in [[trigonometry]]. |
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All triangles also have three sides as well. |
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A triangle is a 2-simplex (see [[polytope]]). |
A triangle is a 2-simplex (see [[polytope]]). |
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A triangle is called |
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* ''equilateral'' if all its sides have the same length (or equivalently: all its [[angle]]s are equal) |
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* ''isosceles'' if two of its sides have the same length (or equivalently: two of its angles are equal) |
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* ''right'' if one of its [[angle]]s is a right angle (90 degrees or π/2 radians) |
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* ''obtuse'' if one angle is bigger than a right one |
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* ''acute'' if each angle is smaller than a right one |
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A triangle is also a [[music|musical]] instrument of [[percussion]], usually made of steel. |
A triangle is also a [[music|musical]] instrument of [[percussion]], usually made of steel. |
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Revision as of 09:32, 3 May 2002
A Triangle is one of the basic shapes of geometry: a two-dimensional figure with three vertices and three sides, which are straight line segments. Triangles are studied in trigonometry. A triangle is a 2-simplex (see polytope).
A triangle is called
- equilateral if all its sides have the same length (or equivalently: all its angles are equal)
- isosceles if two of its sides have the same length (or equivalently: two of its angles are equal)
- right if one of its angles is a right angle (90 degrees or π/2 radians)
- obtuse if one angle is bigger than a right one
- acute if each angle is smaller than a right one
A triangle is also a musical instrument of percussion, usually made of steel.