rechtwinklige

Rechtwinklige is the inflected form of the German adjective rechtwinklig, meaning having a right angle or right-angled. The term derives from recht (right) and Winkel (angle) and is commonly used in geometry and technical language to describe figures with one or more 90-degree angles.

In grammar, rechtwinklig declines according to gender, case, and article. The form rechtwinklige appears as the singular after a definite article: das rechtwinklige Dreieck (the right-angled triangle) or die rechtwinklige Linie (the right-angled line). With an indefinite article, the form becomes ein rechtwinkliges Dreieck (a right-angled triangle). In plural after a definite article, the form is die rechtwinkligen Winkel (the right-angled angles).

Usage typically covers mathematical descriptions, geometric figures, and engineering texts where precise angle relationships matter. The term is closely related to terms such as rechtwinkliges Dreieck, Winkel (angle), and the concept of perpendicularity, which is central to the Pythagorean theorem and Euclidean geometry. In everyday language, speakers may simply use rechter Winkel to refer to the noun phrase “right angle.”