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Line 1: − + − The sum of the internal angles of a triangle is always 180º.+
euclidean
A triangle is a three-sided figure. In geometry, each side of a triangle is perfectly straight.
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]]).