Kulmamäärä

Kulmamäärä is a Finnish term that translates to "angle sum" or "sum of angles." It commonly refers to the sum of the interior angles of a polygon. For a simple polygon with n sides, the sum of its interior angles in degrees is given by the formula (n-2) * 180°. This formula is a fundamental concept in Euclidean geometry. For instance, a triangle (n=3) has an angle sum of (3-2) * 180° = 180°. A quadrilateral (n=4) has an angle sum of (4-2) * 180° = 360°.

The concept of kulmamäärä can also be extended to other geometric shapes. For example, the sum of the angles around a point in a plane is always 360°. In three-dimensional geometry, it can refer to the sum of the angles in a spherical polygon or the solid angles within a polyhedron. However, in most elementary contexts, kulmamäärä specifically denotes the sum of the interior angles of a planar polygon. Understanding kulmamäärä is crucial for solving various geometry problems, including determining unknown angles within polygons and classifying different types of polygons based on their angle properties.