angles - Winkel

names of angles

Name EN Name DE Description
acute angle spitzer Winkel $${0 < \alpha < 90°}$$
right angle rechter Winkel $${90°}$$
obtuse angle stumpfer Winkel $${90° < \alpha < 180°}$$
straight angle gerader Winkel $${180°}$$
reflex angle überstumpfer Winkel $${180° < \alpha < 360°}$$
full turn Vollwinkel $${360°}$$

supplementary angles - Nebenwinkel (Ergänzungswinkel)

two angles on a line add up to 180°

complementary angles

These are angles that add up to 90°

vertically opposite angles - Scheitelwinkel

vertically opposite angles are equal

angles on parallel lines cut by a transversal

sketchometry

alternate interior angles - Wechselwinkel (Z-Winkel)

the alternate interior angles are equal

corresponding angles - Stufenwinkel (F-Winkel)

correponding angles

interior (exterior) angles on the same transversal - Nachbarwinkel (E- Winkel)

interior angles on the same transversal add up to 180°

angles in a triangle - Die Winkelsumme im Dreieck

constructions of triangles


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