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Topic: MATHS

right angle

 noun
     
right angle [countable]
1HM an angle of 90°, like the angles at the corners of a square
2

at right angles (to something)

HM if two things are at right angles, they make a 90° angle where they touch:
Hold the brush at right angles to the surface.
—right-angled adjective:
a right-angled bend
Definition of right angle from the Longman Dictionary of Contemporary English within
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