Trekanter
Trekanter is the Danish term for triangles, a fundamental class of polygons in geometry. A triangle has three sides, three vertices, and three interior angles. The sum of its interior angles is always 180 degrees. Triangles are the simplest polygons and provide a basis for understanding more complex shapes; any polygon can be divided into triangles in a process called triangulation.
Triangles are commonly classified by their side lengths: equilateral (all sides equal), isosceles (two sides equal),
Key properties include the triangle inequality, which states that the sum of the lengths of any two
Triangles also exhibit congruence and similarity. Two triangles are congruent if they have matching side lengths
Trigonometry in triangles uses the Law of Sines and Law of Cosines to relate sides and angles.
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