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the angle bounded by two lines perpendicular to each other : an angle of 90° or <sup>1</sup>
⁄2 π radians.

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An

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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°.

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