From Longman Dictionary of Contemporary EnglishRelated topics: Mathsright angleˈright ˌangle ●○○ noun [countable]    1 HMan angle of 90°, like the angles at the corners of a square2 at right angles (to something)right-angled adjective  a right-angled bendExamples from the Corpusright angleContinue folding at a right angle to the end of strip.Window eaves and roof gutters curve in organic efficiency rather than follow a mechanical right angle.Pluto's right angle to Mercury insists a bright new day is dawning.

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直角

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(n.) synonyms

vertical angle

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