# Difference between revisions of "Triangle"

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− | A triangle is a three-sided figure | + | A triangle is a three-sided figure. |

− | + | In Euclidean geometry, each side of a triangle is perfectly straight, and the sum of the internal angles of a triangle is always 180º. | |

A [[right triangle]] has one 90º angle. Right triangles have special properties (see [[trigonometry]]). | A [[right triangle]] has one 90º angle. Right triangles have special properties (see [[trigonometry]]). |

## Revision as of 01:12, 23 April 2007

A triangle is a three-sided figure.

In Euclidean geometry, each side of a triangle is perfectly straight, and the sum of the internal angles of a triangle is always 180º.

A right triangle has one 90º angle. Right triangles have special properties (see trigonometry).

See: polygon