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right angle

NOUN

1.

the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.

Source:
Dictionary.com

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en.wikipedia.org/wiki/Right_angle

In geometry and trigonometry, a

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study.com/academy/lesson/what-is-a-right-angle-definition-formula-quiz.html

In this lesson, you will learn about the properties that identify

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www.khanacademy.org/math/basic-geo/basic-geometry-shapes/basic-geo-quadrilaterals/a/right-angles-in-shapes