kolmnurgas

Kolmnurgas is the inessive case form of the Estonian noun kolmnurk, meaning triangle. It is used to express location inside the triangle or within its interior, for example in mathematical descriptions or everyday language: Punkt asub kolmnurgas (A point lies inside the triangle).

In Estonian, nouns decline for cases, and the inessive singular often ends with the suffix -s, producing forms like kolmnurgas. This form functions as a prepositional-like expression, indicating that something is located within a triangle, without needing a separate preposition.

Kolmnurgas appears in various contexts, especially in geometry and geometry-related explanations. It helps specify where a point, line, or region is relative to a triangle, such as points inside the figure or areas contained within its boundaries. The phrase is commonly understood in both technical texts and general language.

There is also a closely related construction using kolmnurga sees, which uses the genitive kolmnurga with the postposition sees to convey a similar meaning of being inside the triangle's interior. The choice between kolmnurgas and kolmnurga sees can depend on stylistic preferences or register, but kolmnurgas is the standard and most widely used form in everyday language and mathematical writing.

See also: kolmnurk, Estonian grammar, geometry.