prostoktnym

Prostoktnym is the instrumental singular masculine form of the Polish adjective prostokątny, meaning rectangular or right-angled. It is used to describe figures or angles that have the characteristic of a rectangle or a right angle. In mathematical and technical language, the term appears in phrases such as kątem prostokątnym (a right-angled angle) or referring to right-angled figures, for example trójkąt prostokątny (a right-angled triangle).

In standard Polish orthography the correct form is prostokątnym, with the diacritic on the a (prostokątnym). The form prostoktnym without the diacritic may be encountered in ASCII-only texts, when diacritics are stripped, or as a typographical simplification. The underlying adjective prostokątny is derived from prostokąt (rectangle).

Usage notes:

- Trójkąt prostokątny describes a triangle with a 90-degree angle.

- Kąt prostokątny is a right angle; in instrumental form it appears as kątem prostokątnym.

- In Polish, prostokątny is typically paired with nouns denoting shapes or angles rather than with all types of figures.

See also:

- prostokąt (rectangle)

- trójkąt prostokątny (right-angled triangle)

- kąt prosty (right angle)

Overall, prostoktnym functions as a grammatically inflected form of the adjective used to convey the property of being right-angled or rectangular, with diacritics preferred in proper Polish spelling.