bn:00067819n
Noun Concept
Categories: Angle
EN
right angle  90 degree angle  90 degrees  90°  Ninety-degree angle
EN
The 90 degree angle between two perpendicular lines WordNet 3.0
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EN
In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or π {\displaystyle \pi } /2 radians corresponding to a quarter turn. Wikipedia
90° angle (π/2 radians): an angle that bisects the angle formed by two halves of a straight line Wikidata
Half of the angle formed by a single straight line, equivalent to 90 degrees. Wiktionary
Angle of 90 degrees. Wiktionary (translation)
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